1. They need an activity  __________they can learn to cooperate with each other.

2. They were both   __________(certain) about what to do and went to their uncle for help.

3. As the meeting was on£¬the man who was late   ________(slide) into the meeting room without being noticed.

4. He got into a situation where it is hard    __________(decide) what is right and wrong.

5. Both sides said that they wanted to try to reach a    __________(settle) in a peaceful way£¬not by violence.

6. Fortunately£¬someone who happened to be passing by called the fire department        __________(instant) the fire broke out.

7. The dustman    __________(sweep) up all the fallen leaves on this street yesterday.

8. Mark went into the room and picked up the    __________(receive) and started to dial his friend's number.

9. Her parents gave her so much money that she's got no __________(motive) to get a job.

10. The   __________(recycle) water is used to water plants.