32、-- I was wondering if we could go skiing on the weekend.

-- _______good.
A. Sound        B. Sounded     C. Sounding      D. Sounds

31、I had travelled only two hours one day _____ the winds increased so much that I had to put my tent up ____ the winds became too strong.

A. when; before    B. then; but      C. while; because    D. but; before

30、The biggest problem for most plants, which ________ just get up and run away when threatened, is that animals like to eat them.

A. shan’t        B. can’t               C. needn’t                    D. mustn’t

29、--- There is still a copy of the book in the library. Will you go and borrow        ?

---No, I’d rather buy         in the bookstore.

A .it; one        B. one; one            C. one; it                  D. it; it

28、---How’s your tour around the North Lake? Is it beautiful?

---It ________ be, but it is now heavily polluted.

A. will            B. would               C. should                      D. must

27、I like _______ in the autumn when the weather is clear and bright.

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

25、The children went home from the grammar school, their lessons ____ for the day.

A． finishing      B． finished     C． had finished         D． were finished

24、The book was written in 1946, ____ the education system has witnessed great changes.

A．when        B． during which        C． since when         D． since then

23、Science and technology have ____ in important ways to the improvement of agricultural production.

A． connected          B． assisted     C． contributed         D． witnessed