It is the farmers who provide us with food, yet they are ________ by some citizens．

A．looked forward to

B．looked down upon

C．looked back upon

D．looked up to

The doctor's first reaction was a strange ________ of joy and anger．

A．mixture

B．collection

C．mass

D．number

By ________, people in western countries can play jokes on others on April 1st．

A．system

B．history

C．habit

D．tradition

－Will you give up the plan?

－No．No matter what the result is, I'll still ________ to do it．

A．manage

B．try

C．allow

D．encourage

There was a hole in the door, through which I ________ sight of Mr．Brown sitting in a chair．

A．caught

B．made

C．took

D．got

To make the world a nice place to live in, we should take ________ to protect the environment．

A．ways

B．means

C．warnings

D．measures

The city, ________ by mountains and lakes, is so beautiful that they have decided to stay there for another two days．

A．stood

B．connected

C．blocked

D．surrounded

The whole nation was ________ by the young generation's excellent performances when the disaster happened．

A．remembered

B．forgotten

C．honoured

D．impressed

Seen from space, the earth looks like a blue ball, with ________ 75％ of its surface covered with water．

A．entirely

B．exactly

C．slightly

D．approximately

In spite of these unexpected difficulties, but the Chinese scientists ________ to carry out their experiments on the lonely island．

A．threatened

B．managed

C．offered

D．hesitated