单选题You ______ yesterday if you were really serious about the job.

单选题The doctor told the pupils that an ______ disease was one that could be passed from one person to another.

单选题He felt that the office routine was too ______ for a man of his dreams.

单选题It is estimated that, currently, about 50000 species become ______ every year.

单选题Take your vaccination certificate with you ______ they ask for it at the airport. A. unless B. in case C. when D. because of

单选题Some polls show that roughly two-thirds of the general public believe that elderly Americans are ______ by social isolation and loneliness.

单选题This passage is mainly about the introduction of ______.

单选题If your expenses ______ your income, you will be in debt.

单选题I was ______ the point of telephoning him when his letter arrived.

单选题Never before______available for quick and easy access in so many different fields of study.

单选题-- You've agreed to go. So why aren't you getting ready?--But I ______ that you would have me start at once.

单选题The table has a plastic coating which prevents liquids from ______ into the wood beneath.

单选题__ is known to the world, Mark Twain was a great American writer. 

单选题The story of J. B. S. Haldane is mentioned in the text ______.

单选题Fred was born ______ March 13, 1984.

单选题But for his poverty, he______more students living in the poverty stricken areas to go to universities.

单选题On April 20, 2000, in Accra, Ghana, the leaders of six West African countries declared their intention to proceed to monetary union among the non-CFA franc countries of the region by January 2003, as a first step toward a wider monetary union including all the ECOWAS countries in 2004. The six countries (71) themselves to reducing central bank financing of budget deficits (72) 10 percent of the previous year's government (73) ; reducing budget deficits to 4 percent of the second phase by 2003; creating a Convergence Council to help (74) macroeconomic policies; and (75) up a common central bank. Their declaration (76) that, "Member States (77) the need (78) strong political commitment and (79) to (80) all such national policies (81) would facilitate the regional monetary integration process. The goal of a monetary union in ECOWAS has long been an objective of the organization, going back to its formation in 1975, and is intended to (82) a broader integration process that would include enhanced regional trade and (83) institutions. In the colonial period, currency boards linked sets of countries in the region. (84) independence, (85) , these currency boards were (86) , with the (87) of the CFA franc zone, which included the francophone countries of the region. Although there have been attempts to advance file agenda of ECOWAS monetary cooperation, political problems and other economic priorities in several of the region's countries have to (88) inhibited progress. Although some problems remain, the recent initiative has been bolstered by the election in 1999 of a democratic government and a leader who is committed to regional (89) in Nigeria, the largest economy of the region, raising hopes that the long-delayed project can be (91) .

单选题Promptness is important in American business, academic, and social settings. The importance of punctuality is taught to young children in school. Tardy slips and the use of bells signal to the child that punctuality and time itself are to be respected. People who keep appointments are considered dependable. If people are late to job interviews, appointments, or classes, they are often viewed as unreliable and irresponsible. In the business world, "time is money" and companies may fine their executives for tardiness to business meetings. Of course, it is not always possible to be punctual. Social and business etiquette also provides rules for late arrivals. Calling on the telephone if one is going to be more than a few minutes late for scheduled appointments is considered polite and is often expected. Keeping a date of a friend waiting beyond ten to twenty minutes is considered rude. On the other hand, arriving thirty minutes late to some parties is acceptable.

单选题A: I really must be going now. B: ______