IV, 

1, A          2, C           3, B          4, A           5, A

V,

1, How much does these shoes cost?

2, I spend about 5 minutes going to school by bike.

3, He often spends 2 hours doing his homework.

4, It takes her 1 hour to do her homework.

5, Where will she send her letter?

6, They usually go to school on foot.

7, He usually go to school by bike.

8, Mr. Hung sometimes flies to work.

9, They are alway go to school early.

10, I prefer listening to music at home to going to the concert.

11, Of the three, Nam is the tallest person.

12, We prefer listening to music to playing chess.