—Mathilde, did you find that necklace?

—No, I didn’t find _______, so I have to buy a different _______ to return to my friend.

A. one, one　　　 B. it, it　　　　　 C. one, it　　　　 D. it, one

I've ___________ never to hurry. 我已养成凡事从容不迫的习惯。

I meant to　　　　　　　　　　　　　 (介绍你) to the host at the party, but I forget.(introduce.)

“Did Peter fix the computer himself?”

“He _______, because he doesn’t know much about computers.”

A. has it fixed　　　　　　　　

B. had fixed it

C. had it fixed　　　　　　　　

D. fixed it　

With the development of science and technology, people’s life _______ in the past few years.

A. improved　　　 B. has improved

　 C. is improving　 D. had improved

The Olympic Games，____________ in 776 BC，did not include women players until 1912．

A．first playing B．to be first played C．first played D．to be first playing

The teacher's explanation _______________ the puzzling problem.

Let’s see how much has been ________ building the new house.

A. paid    B. cost     C. spent     D. taken

Try your best to give a v _______ description of what you have seen in the picture.

＿＿several times, the young scientist still kept on making his experiments.

　　A.Having been failed    B.Having failed

　　C.Though failed         D.Because of failure