With more forests being destroyed，huge quantities of good earth ________ each year.

-----Do you regret having quit your job?----Why should I? I ________ as much ,but I really enjoy the present one.

The Diaoyu islands, in the East China Sea between China and Japan, _______ to China since ancient times.

— Have you got any job offers?— No. I ______.

— Have you graduated from collage?— Yes, ________.

He______on the farm for twenty years and now he is a teacher.

Would you please keep silent? The news that the milk contains a harmful chemical______ and I want to listen.

Jack doesn’t smoke now, but he _______ for almost twenty years.

______ of danger in the street at night, she had to go home, with a friend _____ her.

So far this year we ________ a fall in house prices by between 5 and 10 percent.

---Don't put the waste on the ground. ---Oh, I'm very sorry. I ________ the dustbin（垃圾箱） there. 

By the time she ________ home, her parents will have prepared some delicious food for her. 

With the development of modern society, E-mail as well as telephones         an important part in daily communication.

Seeing the chemical ________ to the sunlight, Mr. Lee warned the workers to be careful when dealing with it.

The book has been translated into thirty languages since it ______ on the market in 1973.

The inner connection for the entire area _____when there was a sudden power cut yesterday.

After class, Mr. Zhang’s extra instructions to the class helped _____ the assignment to his students.

 —I have just received another message, telling me I have won a big prize. —Don't jump on it. You ________. 

一When shall we start the restoration of the historic buildings?一Not until our plan________ by the committee.

—Have you seen my e-mail about our TESL project?—Yes. Luckily I checked my e-mails yesterday. Normally I         my e-mail box for days.