It is strongly suggested that measures________factories to pour waste into rivers by the government.

The boy is lying on the ground, _________at the aeroplane in the sky.

I saw _____ eighty-year-old man with an umbrella on such a sunny day just now.

“________ give up (放弃), then youcan be successful.”

ecause they make more money than Ido, _____ they seem to look down on me.