2.There were about 1,700 million people in the world at the ________ (开始)of the 20th century.

1.___________ (邮票)are used for sending letters.

5.Machines are used for making things.(就画线提问)

________ _______ machines used for?

3.We must finish homework on time.(改为被动语态)

Homework ______ ______ _______ on time.

you tell me how I can get to the park?(改成同义句)

Can you tell me ______ ______ _____ the park?

2.Bob isn’t a teacher. He isn’t a farmer, either.(改为同义词句)

Bob is ______ a teacher ______ a farmer.

1.“Can I try on the coat?” I asked.(改为带宾语从句的复合句)

I asked ________ I _______try on the coat.

Shopkeeper: Good morning! What ______ I do ______ you?

Lucy: ________like a skirt, please.

Shopkeeper: _________ kind do you want? The cotton ones are hanging here and the woolen ones are _____ there.

Lucy: Can I have a _____ _____ the woolen ones, please?

Shopkeeper: Yes, of course, Here you are.

Lucy: I like them, but they ______ too much.

Can I have a Look at the cotton ones, please?

Shopkeeper: Yes, please. No ______! Please _____ you time!

20.(　　 )You _____ English better if you _____ harder.

A. learn…will work　 　　B. will learn…work　　 C. learn…work

19.(　　 )Those beds _______ wood.

A. is made of　　　 B. are made of　　 C. are made for

18.(　　 )If you don’t understand a word, you may in a dictionary.

A. look at it　　　 B. look for it　　　 C. look it up