某人
Please pass me the dictionary _____ cover is black.
Please pass me the dictionary \_\_\_\__ cover is black.
We must have an engineer _____ the workers build the house.
We must have an engineer \_\_\_\__ the workers build the house.
It is _____ to fly an airplane at three thousand miles an hour.
It is \_\_\_\__ to fly an airplane at three thousand miles an hour.
Martin, when you go to the meeting tomorrow, _____ your iPad with you.
Martin, when you go to the meeting tomorrow, \_\_\_\__ your iPad with you.
That student _____ his hand every time I asked a question.
That student \_\_\_\__ his hand every time I asked a question.