D.

I.

1.stamp collecting is an interesting hobby.

2.you can learn many things, such as the geography of a country from stamps.

3.postal stamps are a source of interesting facts and important dates about every country in the world.

4.it makes stamp collecting become very popular.

5. as you look at the pages of a stamp album, you can learn interesting details of foreign customs, arts, literature, history and culture.

6.their colors can make you feel relaxed and happy.

7.collecting stamps can become a business.

8.if you are lucky in finding a special stamp, it will bring you some money besides knowledge and pleasure.

II.

$1.$how much  does this watch cost ?

$2$.how much do these beatiful scarves cost ?

$3$.can you tell me how to go to dong nai post office ?

$4.$can you tell me how to go to the station ?

$5.$they typing pasts

$6.$peter works hard 

$7$.there aren't any bottles on the shelf

$8.$we don't have time to prepare the speech

III.

$1.A $

$2.B$

$3.B$

$4.A$

$5.C$

$6.C$

Test yourself 

I.

1.A

2.A

3.D

4.D

5.B

III.

1.b

2.b

3b.

4.a

5.c

6.a

II.

1. How much is this cost

2. How mucch are these beautiful scarves?

3. Can you tell me how to go to Dong Nai Post office.

4. Can you tell me the way to the station?

5. They type very fast.

6. Peter works very hard.

7. There aren't any bottles on the shelf.

8. We don't have anytime to prepare the speech.