Scientists say it may be five or six years ___ it is possible to test this medicine on human patients.

A. since                 B. after                 C. before              D. when

It is no use _____ such mistakes. You should learn a lesson from them.

A. regret to make               B. regretting to make   

C. to regret making                   D. regretting making

It is _____ he often fails in exams ____ makes his parents worried about him.

A. what; that          B. that; what          C. that; that           D. 不填；that

I don’t know if he’ll be home tonight or not, you’ll just have to ____.

A. take an opportunity                        B. take a chance

C. take a luck                                     D. take in part

Today Xiao Li is absent ___the class. He ___ ill.

A. for; could have been                       B. with; should have been

C. at; could have been                         D. from; may have been

They had all children well looked after ____ their parents relieved(放心)

  A. making  B. being made C. to make  D. made

. Let’s hope the weather ____ for Saturday’s tennis match.

  A. keeps up  B. picks up  C. carries on  D. puts up

—When are the traffic police strong?    _---When they ___ up cars with one hand.

  A. put   B. hold     C. pick   D. lift

Strangely the story ___ is popular ___ the young.

  A. made up; with    B. made up; to

  C. made up of; with    D. made up of; to

. Many animals have little connection with ___ animals of ___ different kind if they don’t kill them for food.

  A. the; a   B./ ; a   C. the; the   D. /; the