Danny _____ hard for long to realize his dream and now he is popular.
[     ]
A. works
B. is working
C. has worked
D. worked
—  Do you think we should accept that offer? 
—  Yes, we should, for we _____ such bad luck up till now, and time _____ out.

[     ]

A. have had; is running
B. had; is running
C. have; has been run
D. have had; has been run
Leonardo da Vinci (1452 - 1519) _____ birds kept in cages in order to have the pleasure of setting
them free.
[     ]
A. is said to be buying
B. is said to have bought
C. had said to buy
D. has said to have bought
She has set a new record,that is, the sales of her latest book ______ 50 million.
[     ]
A. have reached
B. has reached
C. are reaching
D. had reached
Although medical science _____ control over several dangerous diseases, what worries us is that some
of them are returning.
[     ]
A. achieved
B. has achieved
C. will achieve
D. had achieved
The first use of atomic weapons was in 1945, and their power _____ increased enormously ever since.
[     ]
A. is
B. was
C. has been
D. had been
I wonder why Jenny ______ us recently. We should have heard from her by now.
[     ]
A. hasn't written
B. doesn't write
C. won't write
D. hadn't written
The old couple have been married for 40 years and never once _____ with each other.
[     ]
A. they had quarreled
B. they have quarreled
C. have they quarreled
D. had they quarreled
— You've agreed to go.So aren't you getting ready?
— But I ______ that you would have me start at once.
[     ]

A. didn't realize
B. don't realize
C. haven't realized
D. hadn't realized

Never before _____ so highly successful in his attempts to change the weather slightly on a very small scale.
[     ]
A. man has been
B. man is
C. will man be
D. has man been
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