— Doesn’t he lose heart even if the experiment hasn’t been working out?— ________. Nothing defeats him.
Electricity is not easy _________ when an earthquake happens.
Mary wanted to ______ her experiment, but her parents encouraged her to continue.
He is _________ and I believe he can keep the secret for you.
I hear that you will go to Beijing this afternoon. Who ______ you off at the airport?
—How long have you been working as an assistant here?—__________I finished middle school.