—Is there anything wrong?—No, so far I _____ no trouble.
—Is there anything wrong?—No, so far I \_\_\_\__ no trouble.
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There is a knock on the door. It is the second time someone _____ me this evening.
There is a knock on the door. It is the second time someone \_\_\_\__ me this evening.
You’ve already missed too many classes this term. You _____ two classes just last week.
You’ve already missed too many classes this term. You \_\_\_\__ two classes just last week.
Return the book immediately to the library as soon as you _____ with it.
Return the book immediately to the library as soon as you \_\_\_\__ with it.
Please be sure to telephone me the next time you _____.
Please be sure to telephone me the next time you \_\_\_\__.
Smith is to study medicine as soon as he _____ military service.
Smith is to study medicine as soon as he \_\_\_\__ military service.
It is _____ to fly an airplane at three thousand miles an hour.
It is \_\_\_\__ to fly an airplane at three thousand miles an hour.
The dispute is _____ to be settled for a long time to come.
The dispute is \_\_\_\__ to be settled for a long time to come.
The development of industry has been _____ gradual process throughout _____ human existence, from stone tools to modern technology.
The development of industry has been \_\_\_\__ gradual process throughout \_\_\_\__ human existence, from stone tools to modern technology.
Being able to afford _____ drink would be _____ comfort in those tough times.
Being able to afford \_\_\_\__ drink would be \_\_\_\__ comfort in those tough times.