“Walk this ________, please!” he said.

[　　]

________ , we have learned 200 new words.

[　　]

Tie the boat ________ it won't be washed away.

[　　]

Sunglasses can be used to ________ the sunshine from ________ our eyes.

[　　]

Have you ever ________ the famous person before?

Yes. He is often introduced to us in our class.

[　　]

The dog should ________ the iron bar because it is dangerous ________ people.

[　　]

A nail ________ the wall so that we can ________ the hook.

[　　]

Neither Tom nor his classmates ________ going to ________ George at the station.

[　　]

________ is best to plant more green trees in northern part of China.

[　　]

The old man is seen ________ slowly ________ a sweat suit in the morning.

[　　]