Finish your homework first, then you'll surf the Internet for half an hour.
| A．can | B．need |
| C．be able to | D．may |
It’s bad for us to __________ at night.
A. stand up
B. take up
C. stay up
—How much ______ this pair of shoes?
—Ten dollars ______ enough.
A. is, is
B. is, are
C. are, are
This is the tallest building ________ I’ve ever seen.
A. which B. who C. that
Sally has a beautiful ________. Listen! She is singing very well.
A. accent B. noiseC. voice
Nowadays, many young children like chatting ________thier friends _______ the Internet.
A. with, in
B. with, on
C. for, on