He said to me,“You should do the right thing ________ the right time.”

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Please meet me ________ the square ________ sunset.

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They were told to ________ on the bottle ________ taking the medicine.

[　　]

A．follow the instructions; for

B．follow the instruction; for

C．follow the instructions; on

D．follow the instruction; on

Professor Smith was asked to give us ________ how to learn English.

[　　]

We plant trees ________ and many of the trees are growing tall ________.

[　　]

A．year after year; year after year

B．year by year; year by year

C．year after year; year by year

D．year by year; year after year

The fact that Cook's journey by ship was quite ________ surprised most travelers with many year ________.

[　　]

A．experience; experiences

B．an experience; experience

C．a few experiences; experience

D．experiences; experiences

He made another wonderful discovery, ________ of great importance to science. (NMET 1998)

[　　]

This kind of plant may grow to a height of several feet, ________ weather conditions.

[　　]

They promised that they would try to finish the work ________.

[　　]

I don't like the way ________ you speak to her.

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