I have never seen the word ______ that way before.

A. to use B. used    C. using  D. to be used

 So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ____ .

A. mustn’t be                B. may not be               C. can’t be             D. won’t be

. I love hobbies ______ you can see hard work and perseverance turn into positive results.

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

 Catherine bought a postcard of the place she was visiting, addressed _______ to _______ and then posted it at the nearby post office.

A. it; her               B. it; herself           C. herself; her     D. herself; herself

She looked up and nodded for me ______..

A. to come in  B. coming in   C. came in      D. come in

Oh, much smoke here ! Somebody _____ the window, please.

      A. opens         B. open           C. shall open          D. will open

．— Have you ever visited the Opera House?

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

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

       The driver _____, according to the newspaper, to have been killed in the traffic accident.

   A. said           B. was saying       C. was said        D. had been said

 If we had taken the other road, we ________ earlier.

A. would arrive             B. might arrive             C. had arrived        D. might have arrived

. I want to be very careful to talk only about ____ we've formally tested.

A. which                      B. that                          C. what                        D. whether