Your words are contrary (to/in/on/of) your acts.

He always prevents me_______ doing my duty.

Was your friend successful ___________ getting a loanfrom the bank?

You must settle the matter .......... yourselves.

My little son was interested ............... fixing broken objects and making new things.

You should make use___________ the books you have.

We have to apply effective measures to save many plant and animal species ........ extinction.

They held a party to congratulate _______ their son’s success to become an engineer.

I want you to arrange these .......... order by putting the largest first then the next, and so on...

Some large cities may have to ban cars.... the city center to wipe out smoke.

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

He is a friend .......... mine.

I was disappointed ________ the grade I received on my last essay. 

She was very angry _____________ Tom.

This apartment would be too crowded for two people, but it is perfect ___ one.

They translated the letter ______ French.

I'm very sorry ............. what I have done.

I was standing .......... the back, so I couldn’t see very well.

There is an increasing demand _____ taller building in big cities.

When I bought the house, my sister helped me_________ with a loan.

Not all books belong _________this class.