65. After having failed many times, the young man refused to try it .
A.again and again | B.once more |
C.less | D.over and over again |
is no doubt that the Great Wall is one of the wonders of the world.
A.There | B.It | C.This | D.That |
— Whose Chinese vase is it?
— I have no idea, but I’m pretty sure it _______ the old lady.
A.doesn’t belong to | B.belongs to |
C.isn’t belonging to | D.belonged to |
Mike ________ his car, for he came to work by bus this morning
A.can have found | B.could have found |
C.can’t have found | D.mustn’t have found |
______ is known to all,the Amber Room belongs to the Russians.
A.As | B.Which | C.It | D.What |
_____ these experiments were successfully completed would we think of
going into humans.
A.If only | B.So that | C.Only if | D.Even if |