——Did you find the missing couple in the mountain yesterday?——No, but we _____ to get in touch with them ever since.

----- You seem in low spirits. Anything wrong?----- I ______ in the important exam. I let my parents down.

---- The battery in my cell phone is running low. ---- I _____ that last night before we went to bed.

--The window is dirty.----I know. It ______ for weeks.

What shall human beings do if oil        sometime in the future?

Don’t call me at 9:00 o’clock tomorrow morning ,when I          a lecture at Harvard. 

If you       be in time for the early bus , be sure to get up before five o’clock in the morning. 

The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he  often mentions.

Jerry, who came to Shenyang last year, spent ￥80,000 more than he ________ on a new flat.

The new play ______ next week.。

— Has Yang Liping returned from Yunnan yet? I’d like to meet her.— Sorry. She ____ back here only for last weekend.

---Where       you put my dictionary?---I left it on your desk when you     to Tom.

---Where is your new home now? ---In the new developed zone. But I     downtown for five years.

The country life he was accustomed to________ greatly since 1992. 

Had you listened to the doctor, you _______ all right now.

With more forests being destroyed, huge quantities of good earth __________ each year, which __________ that our environment is suffering.

I       Beijing in a few days. Do you know when the earliest plant      ?

Mr. Li        certainly        a new house if more new houses       .

The new dictionaries are very useful. They        well and       already.

A new cinema      here . They hope to finish it next month.