—What are you doing? —I'm the key to the door.A. finding out B. looking after C. looking for
It’s important ____the piano well.
The _____you work , the _____grades you will get.
The teacher was very pleased _____ Tony’s answer.
There are some new words on the blackboard. Please _____ in your exercise books.
The English book is easy for Tom because there are _____few new words in it.