what has recently been done to provide more buses for the people, a shortage of public vehicles remains a problem.
______ frightened us ______ a tiger turned up suddenly in front of us.
The boys ______ the newspaper on the ground and began to read the news and articles in it.
Now that she is out of a job, Lucy ______ going back to school, but she hasn’t decided yet.
It is in their ability to speak ______ humans ______ from animals.
—How about your travel? —You can hardly imagine what difficulty we have had ______ the vast desert.