单选题Henry tried many times to _____ smoking but failed.

单选题The doctor will not perform the operation ______ it is absolutely necessary.

单选题Hostess: Would you like another piece of apple pie? Guest : ______

单选题John succeeded ______ what he wanted. A. to get B. to getting C. in getting D. and getting

单选题How can we get rid of garbage? Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today. Some people think that man might be able to solve both problems at the same time. They suggest using garbage as an energy source, and at the same time it can save the land to hold garbage. For a long time, people buried garbage or dumped(倾倒) it on empty land. Now, empty land is scarce. But more and more garbage is produced each year. However, garbage can be a good fuel to use. The things in garbage do not look like coal, petroleum, or natural gas; but they are chemically similar to these fossil(化石) fuels. As we use up our fossil fuel supplies, we might be able to use garbage as an energy source. Burning garbage is not a new idea. Some cities in Europe and the United States have been burning garbage for years. The heat that is produced by burning garbage is used to boil water. The steam that is produced is used to make electricity or to heat nearby buildings. In Paris, France, some power plants burn almost 2 million metric tons of the cities garbage each year. The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil. Our fossil fuel supplies are limited. Burning garbage might be one kind of energy source that we can use to help meet our energy needs. This method could also reduce the amount of garbage piling up on the earth.

单选题Charles Dickens ______ many wonderful characters in his novels.

单选题It is difficult (to make) yourself (understand) in a foreign country (when) you (have no knowledge) of its language.

单选题{{B}}Passage 23{{/B}} In order to learn a foreign language well, it is necessary to overcome the fear of making mistakes. (23) {{U}}If the primary goal of language use is communication, then mistakes are secondary considerations that may be dealt with gradually as awareness of those mistakes increases.{{/U}} On the other hand, students should not ignore their mistakes. The language learner may observe how native speakers express themselves, and how native expressions differ from the way the learner might say them. For example, a Spanish speaker who has been saying "I do it" to express willingness to do something in the immediate future, could, by communicating with native speakers of English, observe that native speakers actually say "I'll do it". This difference can serve as a basis for the student to change his way of using the present tense in English. But a student who is unwilling to communicate in the first place would lose this opportunity to learn by trial and error.

单选题The search was ______ when the fog got thicker.

单选题The director recommended she ______ English before going abroad. A. have to study B. study C. studies D. will study

单选题She would lose weight but she __________ big．

单选题On AIDS Day, the minister of Health Department demanded that the problems ______ paid special attention to.A. referred to beingB. referred to beC. refer to beingD. refer to be

单选题Although he has lived with us for years, he ______ us much impression.

单选题Had they had enough cash on hand, they would buy this fancy furniture. A. Had B. on C. would buy D. furniture

单选题I remember her face but I cannot ______ where I met her.

单选题We have made up our minds and nothing can prevent us ______ on the experiment.

单选题Selfish people often take (　　)of other people's kindness.

单选题—You couldn't have chosen any gift better for me. —______.A. Well, I thought you would like itB. Well, don't complain about a giftC. I'm glad you like it ever so muchD. That's all right. I'll give you a better one next time