It is high time that we started to consider what ________  we should take to reduce heavy smog caused by traffic fumes and other pollutions.

---Why are you still here? Everybody has gone to attend the lecture by the president.--Oh, I ___________ about it!

 Almost ____ of the students in this class ____ glasses, that is, ____ of them.

The U.S. government on Wednesday _______ former Commerce Secretary Gary Locke as ambassador to China, making him the first Chinese-American ever to take the post.

Anyone who wants to ________ China’s gardens should go to Suzhou, whose gardens are the best examples in the country.