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

She said she could not _____ all the information given in the broadcast.

A new regulation has passed forbidding supermarkets and stores to ____ free plastic bags to shoppers.

 They ___________to put their hearts into study..

If you intend to arouse students’ interest in your project, you’d better ______ your teaching methods more wisely.