Those who don't get their sufficient sleep are actually sending a(n) _____ to severe problems in their life.

   A. invitation        B. warning      C. explanation          D. solution

---Who is to give us the lecture today?

   ---The lady _____ our headmaster into the hall.

   A. follows        B. following          C.  followed   D.  to be followed

______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.

A. To attach     B. Attach      C. Attached        D. Having attached

David studied hard before the examination, and it ______. He made an A.

    A. worked out   B. marked out   C. paid off D. got through

To learn English well, you should ______ as many words and expressions as possible.

    A. distinguish  B. undertake    C. associate    D. accumulate

Your opinion about the modern education is not similar to ____ of the other teachers’.

A. it         B. one       C.  that        D. what

This picture brought the hours back to me ____ I was taken good care of in that faraway village.

A. until      B.  when      C. where       D. that

______ was reported in the local paper, since the carrying out of the performance salary, efficiency in work has ______doubled.

A. As … more than     B. It …rather than  C. What … over    D. That… less than

The traffic accident _________all his life. After that he was limited to a wheelchair.

A. damaged      B. destroyed       C. harmed      D. ruined

— Have you ever visited the Opera House?

    —Yes．When I was in Sydney, I ______ it twice．

A．have visited B．had visited  C． visited     D．would visit