题目内容：

请用恰当的介词填空

1.__________ production up by 60%, the company has had another excellent year.

2.In his factory, the workers are now paid __________ the season.

3.She looks quite young __________ her age.

4.They changed their blue shirts __________ the white ones.

5.Teachers should prove worthy __________ the people’s trust.

6.He has been caught in the rain and is wet __________ the skin.

7.I am tired __________ climbing up the mountain and I won’t go climbing any more.

8.As students, it is necessary to stop __________ weekly intervals and go back over key points in the lesson.

9.Make sure the car is locked because leaving it unlocked is an open invitation __________ thieves.

10.The doctor tried to laugh my mother __________ her fears about the operation.