Before you pay a visit to a place of interest, look in your local library________a book about it.
Carbon dioxide, which makes a________between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.
Poetry written from the________of the urban youth tends to reveal their anxiety over a lack of sense of belonging.
Meals in Spain are quite different from ________ they have in China.
________ seems to be a strong competition in China for senior high students to enter universities does exist in other countries as well.
Before the problem can be solved,it must be obvious ________ the problem itself is.(2011·湖南,31)