It is _____ to fly an airplane at three thousand miles an hour.
It is \_\_\_\__ to fly an airplane at three thousand miles an hour.
某事
—What has _____ the boy who fell off the bike?—Nothing serious. The doctor says that he can come back to school in a day or two.
—What has \_\_\_\__ the boy who fell off the bike?—Nothing serious. The doctor says that he can come back to school in a day or two.
She tried hard, but she still couldn’t make us _____ our mind.
She tried hard, but she still couldn’t make us \_\_\_\__ our mind.
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