He turned his back .......... her.

Plant and animal extinction leads _________ loss of biodiversity.

Every student should spend .......... least two hours on his homework every night.

We traveled overnight to London and arrived ............ 4 o’clock ........... the morning.

No one knew precisely what would happen _____________ a human being in space.

If you want to lose weight, you must go ___________ a diet.

Ottawa is .......... Canada.

As I was ....... of the change in the program, I arrived half an hour late for the rehearsal.

We can't get access _______ the Internet where we live.

When are you leaving __________ Singapore? This week or next week?

Shut the door .......... you.

While studying, he was financially dependent ________ his parents.

Are you aware ________the time?

He is retired. He lives________________ his pension.

Boys! Put your toys ............ It is time to go to bed. Don't stay ............. late.

Jane doesn’t spend much money ______ clothes.

China became the third country in the world to be able to independently carry __________ manned space flights.

She insisted ___________ him wearing the red tie.

Yesterday, I was talking ______my doctor ______a mysterious epidemics near here.

I don’t approve ________ your smoking. I wish you would give __________ that habit.

We can't get everything we want from life; we must just make the best .......... it.