In this section, we will briefly describe possible ways of reducing the costs and risks ______ in doing this.
Watching TV is ________ a kind of relaxation, and it also _______ our knowledge.
Excuse me, but can you tell me________.
The number of the people in the room_______sixty, but a number of them_________students.
What did he say? I don’t know what________.
I told your friend how to get to the hotel, but perhaps I______have driven her here.