There are a lot of computers in the lab,and they need professional __________ to make sure they can be in a good state.

Itis not I but Tom and his wife that ______ for the car accident.

He was a good student and scored_________ average in most subjects

What’s the noise ? It sounds as if it comes from upstairs –______ It must be the window-cleaner working , next door

The meeting lasted as long as three hours and I couldn’t ____________ it until 10 p．m..