Past Modals Practice on "Probability"

Kazumi isn't here today, is he? He ____ be sick.
1. have to
2. can
3. should
4. must
He always drives too fast. He ____ be crazy.
1. should have
2. must
3. have to
4. none of these
She missed three weeks of school. She ____
been very sick.
1. ought to
2. must have
3. should
4. could
You didn't know they were coming? You ____
been surprised!
1. must have
2. none of these
3. have to
4. should have
You did very well on your exams. You ____
been studying hard!
1. may
2. must have
3. should have
4. had to
Jill is so smart. She ____ been a good student.
1. has to
2. should
3. ought to
4. must have
Dr. Hanson took a taxi home. His car ____
not be working.
1. may have
2. might have
3. must
4. none of these
Liz gets up at 7:00 a.m. on Tuesdays. She ____
have an early class.
1. ought to
2. should
3. have to
4. must
The key you gave me didn't open the door. It
____ been the wrong key.
1. should have
2. could
3. must have
4. ought to
I don't see Mr. Tate's briefcase. He ____
gone home already.
1. might
2. must have
3. could
4. ought to
Patty went right to bed when she got home. She
____ been very tired.
1. must have
2. could
3. might
4. none of these
Everyone is wearing an overcoat. It ____ be cold outside.
1. may have
2. could have
3. must
4. none of these