1.Living in the western part of the country has its problems, ___ obtaining fresh water is not the least.

A. with which B. for which C. of which D. which2.Turn on the television or open a magazine and you ___ advertisements showing happy, balanced families.

A. are often seeing B. will often see C. often see D. have often seen3.Criticism and self-criticism is necessary ___ it helps us to find and correct our mistakes.

A. by that B. at that C. on that D. in that4.You see the lightening ___ it happens, but you hear the thunder later.

A. the instant B. for an instant C. on the instant D. in an instant5.Government reports, examination compositions, legal documents and most business letters are the main situations ___ formal language is used.

A. in which B. at what C. on which D. in that6.He has never visited the town _____ he was born.

A. where B. which C. on which D. that7. ___ my return, I learned that Professor Smith had been at the Museum and would not be back for several hours.

A. At B. With C. On D. During8. ___ in the United States, St. Louis has now become the 24th largest city.

A. Being the fourth biggest city B. It was once the fourth biggest cityC. Once the fourth biggest city D. The fourth biggest city it was9.We can´t expect ___ the habits of a lifetime in a short time.

A. for one to change B. one changeC. one to change D. one to be changed10.By 2010, production in the area is expected to double ___ of 1980.

A. that B. it C. one D. wha

t答案：C B D A A     A C C C A