On hearing the bad news, he got up quickly ______ the lunch unfinished.
A. leaving B. left C. to leave D. leave
The girl looked at me with a _______expression. Maybe the problem was quite ______.
A. puzzled; puzzling B. puzzling; puzzled
C. puzzled; puzzled D. puzzling; puzzling
Would you please ______ your statement again? I don’t understand what you were saying.
A. classify B. clear C. clarify D. charity
---How long has the United Nations ________?
--- ______1945.
A. come into existence; In B. been in existence; Since
C. been in existence; From D. come into existence; For
Dr. Black is a professor of chemistry. _______, he is a famous writer.
A. In all B. In brief C. In fact D. In addition
The new invention may __________a lot of changes in our daily life.
A. result from B. expose to C. lead in D. contribute to
