Giải giúp em bài tập này với 
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Exercise 3: Add a sentence with the past perfect, using the
notes.
1. They started working, and then the boss came in. (when)
When
the
boss
2. I made an appointment, and then I when to see the doctor.
(after)
=>
I
went
3. The last bus left before Tom got to the bus stop. (had)
When
Tom
4. The police arrived too late, so the robbers got away.
(already)
=>
Вy
the
time
the
police
5. When did you study at Viet Thanh High School? (have)
=>How
long...
6. People have used the Internet all over the world.
=>The
Internet..
7. She last wrote to him two years ago.
=>She
hasn't.
8. If you don't study hard, you will get bad mark.
=>Unless..
9. We want to play game.
=>We
feel
like
10. Mai took two aspirins, and then she felt a lot better.
=>After.