--I have a letter ________, but I’m too busy.
--Why not have your cousin_______ it for you?
| A．to post; post | B．posted; post |
| C．to post; to post | D．posted; to post |
— We’ve never ______ astronauts’ life though we’re interested in.
— Really? I’ll offer you some books about it.
| A．thought about | B．chatted about |
| C．learned about | D．cared about |
— Jane. I can't find Mike in the playground.
—Oh. He ______ the piano in the music room.
| A．is playing | B．was playing |
| C．has played | D．will play |
—Simon. I hear you are going abroad for further study. Have you decided ______?
—Next September.
| A．when going | B．when to go |
| C．how going | D．how to go |
—Dad, shall we go to the World Park tomorrow?
—Sorry. I won’t be free, but you ______ ask Mum to go with you.
| A．must | B．may |
| C．would | D．should |
You won't work out the problem ______ you understand it. So listen to me explain now.
| A．since | B．when |
| C．unless | D．though |