---I think English is ____unimportant subject.---I don’t think so. It is ____useful tool when we talk with foreigners.
Martin was so busy ______ the old that he gave up his part-time job.
My friend invited me ______ the art club , and I accepted it with pleasure.
Over $30,000 ______ for a children’s hospital by a British girl several months ago.
Tim told us that his company ______ robots to do some of the work.
Now Jerry ______ the exchange programme with his classmates in the meeting room.