The doctor says he ______ be careful about his weight and diet because he has a history of heart disease in his family.
A. must
B. has to
C. should
D. all of the above
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He must ____________ it; he was the only one who had a key.
A. have stolen
B. stole
C. has stolen
D. had stolen
If only I _________ crashed the car!
A. had
B. hadn’t
C. did
D. didn’t
He wouldn’t have been late for the exam if he ____________ earlier.
A. leave
B. left
C. had left
D. hadn’t left
Where is John? He should ___________ home hours ago.
A. be
B. were
C. had been
D. have been
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