一、用适当的引导词或介词填空
1.Light is the fast thing in the world,the speed      which is about 300,000 kilometres per second. 
2.We wrote a letter to our father,telling him all the things       we wanted. 
3.He came out of the spaceship,smiling and waving to the crowds       were waiting for him. 
4.The two brothers were satisfied with this decision,         was agreed beforehand. 
5.When deeply absorbed in work,      he often was,he would forget all about eating and sleeping. 
6.The play,       style is rigidly formal,is typical of the period. 
7.There are 30 chairs in the small hall,most of       are new. 
8.We have only told people       work is relevant to the project. 
9.There are people       whom Catherine was referring. 
10.This is the year        profit should increase.