______ you make a promise, you should keep it.

Every time ______ they met, they would talk several hours together about the persons and things _______ they remembered in the middle school.

The web is fantastic at many things, e-mail, e-commerce, for example. But _____ your name is Amazon Or Google, making money has proved hard.

He decided not to attend her birthday party ______ he had been invited..

You must set off at once, ______you would be late for school.    

It is said that the famous football star is not willing to play for ____would pay him three million dollars a year.

It is well-known ______ a person, especially the old, eats too much he’ll feel uncomfortable.

—Do you think we can get there on time?
—Yes，_______ the truck doesn’t break down. 　

It gives his life a flying start ______ he has gone abroad for further education.

“___________ the election is over,” said Powell, “the time has come for me to step down as secretary of state and return to private life.”