We usually have six lessons a day,and each of them__________45 minutes.
What a pity! I missed meeting my friend at the airport because my car was _____ in the traffic jam.
--- I'd have made a phone call to you, ___________ your telephone number.--- That’s all right.What was up then?
The cousins are alike in age, but _____ they are as different as day and night.
Is it a wonder that _____ little cells can store _____ much energy?
Not having worked out the problem, _____ leave the office.