My children often sleep while they are ................ a plane.

It’s really difficult to .......................a bicycle up the hill.

At this time next week, we ................. a test on sources of energy.

My mother doesn't like coffee and tea.

⇒ My mother likes neither......................

Nuclear power ...............................in the future.

The healthcare system in this city is very bad. There are only 13……………………out of 100,000 residents. (PHYSICS)

I. Choose the correct answer A, B, C or D to complete each sentence.

Overpopulation causes a lot of problems, ………..?