— 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.
The police were seeking more information to find out _______the rich merchant.
Not until he called the secretary three times ______ that the manager went to an important meeting.
In one corner of the garden there stands a little board,_______“Keep off the grass.”
—Are you still very busy? —Yes,I ______ the report for the manager and it won’t take long.
Are there any restaurants in Beijing _____ authentic Mexican food?