Elephants have their own way to tell the shape of an object and       it is rough or smooth .

A. 不填      B. whether      C. how      D. what

 —It’ll take at least 2 hours to do this !

   —Oh ,       ! I could do it in 30 minutes .

A. come on      B. pardon me     C. you are right    D. don’t mention it

 They have a good knowledge of English but little       they know about German .

A. have      B. did     C. had      D. do

 He tried his best to solve the problem ,       difficult it was .

A. however      B. no matter        C. whatever     D. although

 If it is quite        to you , I will visit you next Tuesday .

A. convenient       B. fair         C. easy      D. comfortable

 You should understand the traffic rule by now . You’ve had it       often enough .

A. explaining       B. to explain      C. explain   D. explained

 —Julia said she sent you a birthday card yesterday . Have you got it ?

   —Oh , really ! I haven’t       my mailbox yet .

A. examined       B. reviewed       C. tested       D. checked

 It is what you do rather than what you say       matters .

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

 Bill was doing a lot of physical exercise to build up his       .

A. ability          B. force        C. strength      D. mind

 By the time Jane gets home , her aunt       for London to attend a meeting .

A. will leave       B. leaves      C. will have left     D. left