A.validity
B.tremendous
C.flexible
D.commercial

I find myself at a loss to understand Harold’s behavior.
A.I lost contact with Harold. so l couldn’t understand his behavior.
B.I find Harold's behavior quite incomprehensible.
C.I understand Harold‘s behavior completely.
D.I have to lose a lot to understand Harold‘s behavior.

American Online is an unusual digital company because_____
A.it used to make video games
B.it is innovative
C.it makes money
D.it has joined with another company

Certain species of penicillin are used  to ripe cheese.
A.Certain
B.of
C.are used
D.to ripe

Anita works really hard and ___________ to be paid more.
A.worth
B.values 
C.deserves
D.requires

I hope our plane will leave on __________  .
A.hour 
B.schedule 
C.plan 
D.timetable

______ , the sails of a distant ship are visible before the body of the ship.
A.Because the curve of the Earth
B.The curve of the Earth makes
C.The Earth, in that it curves, makes
D.Because of the curve of the Earth

 “You went to Chile, didn’t you?” “No, but I __________ to Peru, which is right next door."
A.was going
B.had gone
C.was gone
D.did go

President/ trip/ America/ announce/ 8 o’clock news.
A.The President made a trip to America to announce on the 8 o’clock news.
B.The President went on a trip to America and announcing on the 8 o'clock news.
C.The President took a trip to America to announce on the 8 o’clock news.
D.The President’s trip to America was announced on the 8 o’clock news.

He decided to repair the thing himself and not to take it back to the shop.
A.He decided to have the thing repaired and not to take it back to the shop.
B.He took the thing back to the shop because he wanted to have it repaired.
C.He decided to repair the thing himself as he couldn’t take it back to the shop.
D.Rather than taking it back to the shop, he decided to repair the thing himself.