动词填空.
1.It's necesary for us _________ (not make ) any noise in the reading room.
2.The police ______ (try) best to find those robbers these days.
3.The money should _________ (use) to support development projects.
4.I am used to ______ (listen) to music on my MP4 player.
5.Can you tell me how often Olympic Games ______ (hold)?
6.You _________ (lose) the chance to go abroad for further study if you don't pass the exam.
7.I don't believe your family _____(own) the car for ten years.
8.It's meaningful _________ (help) the homeless.
9.He was busy ________ (record) the players' scores.
10.They _________ (group) into two teams of four while playing the ball game just now.
给解释一番.