—You look so sad. What's wrong with you?
—I bought ______ bicycle, but when I rode it, one of _____ wheels became flat.
| A．a；the | B．; the | C．a; / | D．the; a |
—Please _______to return my book by Friday. I'll use it on Saturday.
—No, problem. I'll finish reading it on Thursday.
| A．don't forget | B．not to forget | C．not forget | D．forget not to |
—Hi, guys. Where are you heading now?
—Home. We _________all our money, so we have to walk home now.
| A．spend | B．spent | C．have spent | D．are spending |
This math problem is too difficult. Can you show me________, George?
| A．what to work out | B．to work i t out |
| C．how to work it out | D．how to work out it |
—Who is the little girl in the picture?
—It's me. The picture __________10 years ago.
| A．took | B．is taken | C．has taken | D．was taken |
—Mom, when can I go out to play football?
—Finish your homework first, or I ________let you go out.
| A．don't | B．didn't | C．won't | D．haven't |