When we arrived at the airport, we were told our flight （ ）.

Just as the soil is part of the earth, （ ） the atmosphere.

Solar energy is a new kind of energy _____ that we can use to replace the traditional energy.

Scientists now have some surprising answers about whether brain power（ ）as we get older.

The football match was （ ） on account of rain.

Our company’s service is （ ） in nearly 80 countries around the world.

（ ） the past year as an exchange student in Hong Kong, Linda appears more mature than those of her age.

Since Dick was busy, he rarely had time to go to the cinema; _____.

Have you seen the lion _____under that big tree?

I wrote it down_____I should forget it.

What （ ） would happen if he told mom and dad what we had done?

The meeting is to begin at 4:00 p.m., but as assistants, we’re （ ） to be there a bit earlier.