1. I didn’t hear the phone. I ______ asleep.
A. must be
B. must have been
C. should be
D. should have been
2. We will go camping if it ______ tomorrow.
A. don’t rain
B. didn’t rain
C. doesn’t rain
D. isn’t rain
3. — ______ do you visit you grandparents?
— About once a week.
A. How long
B. How often
C. How soon
D. How far
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