— I’m leaving now.

   — ________ sure you turn off the switch.

   A. To make             B. Make                 Made                            D. Making

Global warming causes the ocean ________, which in turn speeds ice melting.

   A. to warm           B. warming           warmed                 D. warm

A person ________ email account is full won’t be able to send or receive any emails.

A. who                        B. whom                whose                  D. whoever

Many people expect that credit cards will eventually______ paper money for almost every purchase.

A. trade                  B. replace               exchange           D. reduce

 —I’ll call you at 9 tomorrow morning, OK?

   —You’d better not, I ______ the piano then.

   A. will be practicing                                B. am about to practice

  am practicing                                D. practiced

 It took me quite a long time to ________the new environment here.

   A. adapt to                     B. relate to             apply to                 D. attach to

Mary wrote books to earn money while John gained his wealth ________ selling Mary’s works.

   A. with                   B. by                     on                         D. through

 It occurred to me ________ Jack might be interested in the problem we had discussed.

A. what                   B. why                   how much                     D. that

 After being broadcast on TV, the news was known by all ________.

   A. at any time          B. in no time          all the time                    D. at one time

— Mary, let’s go to the lecture by Hawking, which is said to be very interesting.

   — I’d like to, but I ________ finish the report first.

A. can                     B. may                   must                      D. shall