VI. Fill in each blank with one suitable preposition. (5 points)

1. Dr. Smith sees patients only __________ appointment.

2. His life is __________ the balance but the doctors he will recover.

3.  I’m not free just now, but come at 6; I’ll be __________ duty then.

4. She was very conscious __________ her lack of experience on her first day at work.

5. He has a new solution __________  the problem

trả lời

1. A - excited 2. B- since 3. D - then 4. D – he does 5. A- sent