As a teacher, he is ______ to work hard and must be strict in his work.
_______ the rain falling so hard, it becomes more and more difficult to carry on the rescue work.
At a beach or a swimming pool a lifeguard is a person who is responsible for __________ other swimmers and protecting them from accidents.
The factory produces half a million pairs of shoes every year, 80% are sold abroad.
Her valuable advice ________ to be taken, or you will suffer more loss.
—Ouch! You hurt me!—I am sorry. But I any harm. I to drive a rat out.