If you go by _______train, you can have a quite comfortable journey, but make sure you get_______fast one.

A.the; the B./; a

C.the; a D./; /

While he was investigating ways to improve the telescope, Newton made_______discover which completely changed______ man’s understanding of colour.

A.a, 不填 B.a, the

C.不填，the D.the, a

The “Chinese Dream” is ________ dream to improve people's well－being and ________ dream of harmony, peace and development.

A. the; a B. a; a

C. a; the D. the; the

Jumping out of _______airplane at ten thousand feet is quite _______exciting experience.

A.the ，不填 B.不填，an

C.an, an D.the, the

-------I knocked over my coffee cup.It went right over _______keyboard.

-------You shouldn't put drinks near _______computer.

A.the; / B.the; a

C.a; / D.a; a

While she was in Paris，she developed a________ for fine art.

A. way B. relation

C. taste D. habit

The young man made a ______to his parents thathe would try to earn his own living after graduation.

A.prediction B.promise

C.plan D.contribution

I bought a dress for only 2010 dollars in a sale;it was a real.

A. exchange B. bargain

C. trade D. business

With inspiration from other food cultures, American food culture can take a ________ for the better.

A．share B．chance

C．turn D．lead

Carbon dioxide, which makes a ________ between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.

A．difference B．comparison

C．connection D．barrier