空速管、静压孔采用___方式进行防冰？

____ for a long time, most of the crops in this area died from lacking water.

I was afraid _____ to my customers because I was afraid _____ them.

The great hall was crowded with many people, _____ many children _____on their parents’ laps.

His doctor suggested that he ___ a short trip abroad.

He looked as if he ___ ill for a long time.

I enjoyed the movie very much. I wish I ___ the book from which it was made.

Dr. Bethune worked hard as if he ___.

It is time we ___ up our results.

If I ___ you, I wouldn’t return the call.

He wishes ___ mistakes.