语法与词汇All this leads to a population in the twenty-first century that is smaller ________a fewyears ago
语法与词汇Plastic bags are useful for holding many kinds of food, ________their cleanness, toughness and low cost
语法与词汇As an artist, Jim is certainly an amateur, for he has had no training
语法与词汇The migration from Asia to North America across the Bering Strait (perhaps by land bridge) was a ________ event in human history
语法与词汇That young mans first commercial venture was selling handmade ________ for model airplanes
语法与词汇Piquette must have been seventeen then, although she looked about twenty
语法与词汇Because it was very contagious, everyone in the family came down with the disease
语法与词汇Many scientists remain _____ about the value of this research program.
语法与词汇The phenomenon provides a way for companies to remain globally competitive ________avoiding market cycles and the growing burdens imposed by employment rules, healthcare costs and pension plans
语法与词汇The good news is that as long as people infected with HIV keep taking the triple-drug ________, they have an excellent chance of surviving the infection for a long time
语法与词汇Having been served lunch, ________
语法与词汇The environment pollution is getting worse
语法与词汇Some industry observers predict the development of two parallel home markets
语法与词汇The Titanic turned just in time, ________the immense wall of ice
语法与词汇As there was no road, the travelers ________ up a rocky slope on their way back
语法与词汇In my opinion, he’s _____ the most imaginative of all the contemporary poets.
语法与词汇He must use this surplus as an insurance ________the unpredictable effects of bad weather
语法与词汇We wondered how the information was ________to the press before it was officially announced
语法与词汇(short) Patients were dying because of an acute ________of nurses
语法与词汇We’ll be very careful and keep what you’ve told us strictly _____.