The Great Wall was built to keep ____ the invaders.
I’ll come after the meeting if time ______.
New medicines and instruments ______ every day to extend life.
What I wanted to know was when and where the meeting ______.
If you go there alone after dark you might get _____. A. attacked and robbed B. attacking and robbing B. to attack and rob D. to be attacked and robbed
A red sky in the morning _____ to be a sign of bad weather.