We should try all means to ensure ourselves_____ all possible risks.
. Can you imagine what problem may ________ when human beings are cloned?
. — I have learned that it is not easy to get on well with the new boss. —______? I think that I only need to do my own job well.
. — I ‘ll ask our physics teacher to explain Newton’s Second Law of Motion, which she taught us yesterday. — That’s just _______ most of the students haven’t understood.
. It didn’t _____ him that she would refuse his invitation
. Your luggage will be ___ by the lorry from the airport to your hotel.