Điền động từ khuyết thiếu

Bài 9: Điền động từ khuyết thiếu "mustn't" hoặc "don't have to"vào chỗ trống thích hợp
1. There is a "No turn right" sign. You.
smoke here.
.have an appointment for this doctor. You can
2. The sign says "No smoking". You
3. You.
want.
4. You.
tell me. I already know.
5. The big boss will be at the meeting. You.
6. You can help me if you want to but you.
7. You......
turn right.
8. This area is off limits to everybody. You..
9. You..
10. You.
11. You
.be late.
park your car there. That's the Director's place.
go and see him when you
.come here unless you are invited.
to wear a tie in this company but they prefer it if you do.
criticize David. He's doing the best he can.
drive there. Youcan take the train.
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