3. By the time she got to class, the teacher had already started teaching.

2. By the time she went outside, the bus had already gone.

1. By the time she got up, her brother had already gone into the bathroom.

6. In this way, one of the world’s favorite drinks was invented.

　Unit Ten

5. Some friends of mine had one TV set.

4. A: What are they used for?

　　 B: They’re used for seeing in the dark.

3. A: Who were they invented by?

　　 B: They were invented by Julie Thompson.

2. A: When were the electric slippers invented?

　　 B: They were invented last year.

1. A: When was the car invented?

　　 B: It was invented in 1885.

8. I need to come up with some ways of getting money.

Unit Nine