1. If my watch is broken, I ..... buy a new one because I always need one.
A. have to (phải mua cái mới vì rất cần)
B. might
C. have
D. may
2. I have got an awful headache. If I see a chemist's, I ..... buy some aspirins.
A. must
B. might
C. may (có thể sẽ mua)
D. should to
3. I plan to travel around the world. If I don't visit my father in Japan this year, I .... go to the USA.
A. must
B. have
C. may (có thể tới USA)
D. ought to