—How long _____you ______ here? —About a week. Afterwards I will go to Beijing.

—What a mistake!—Yes. I ______ he do it in another way, but without success.

While _____ to foreigners, you must try to make yourself _____ by using body language if necessary．

.We can’t use the bridge now, because it _______.

The number of deaths from heart disease will be reduced greatly if people ____ to ear more fruit and vitamins.