The government is trying to make the country safe _____ terrorist attacks.

We congratulate you ___________ your successful flight.

Can you help me, please? I can't see the differences .......... these words.

I don't think that I'm acquainted .......... him.

Why were you absent ____________ class this morning?

How would the body react__________ the extreme changes in temperature?

He worked hard ________ a mechanic for ten years before being appointed manager.

We just rested _________ a short time.

William is .......... meanness.

She was sad because he was rude ... her.

Thank you very much____________ inviting me to your party.

The car went .......... full speed.

I waited _____ 10 o'clock and then went home.

She insisted ___________ him wearing the red tie.

She’s very old and can’t live alone. She needs someone to look _________ her.

If you have ever watched television, you have seen plenty .......... drug advertisements.

.......... mistake, I took the wrong book from my desk this morning.

When were you released .......... prison?

We are proud (at /in/on/of) our people's heroic tradition.

Water is essential _____ all life.

I'm not familiar _______ that song.