Those books deal mainly_______ tropical plants.

Due to industrialization, we have to cope ... the fact that many  species are ......... danger ........ extinction.

Water is essential _____ all life.

I prefer this chair .............. the other one. It’s more comfortable.

He congratulated me_______ winning the competition.

Pay attention _______all traffic signs when you are travelling in the street.

She was very surprised ________ the grade she received.

Lack ..... food had stunted his growth.

We are ashamed (at/in/to/of) his behavior.

Please write your answers ......... ink.

On Christmas Eve children go to bed full ........ excitement.

They have been waiting ......... the bus for half an hour.

Toxic chemicals in the air and land have also driven many species ______ the verge of extinction.

His father used the money he won to set_________ his own company.

The gloves aren't very suitable .......... that kind of work.

What do you know .......... him?

They like to sit .......... the fire.

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

I saw Tom ............ a concert last Saturday.

If you look __________ the book, you can find what you need.

Ken prefers Chinese food________ French food.