Don't you think you should try to be friendly ... your classmates?

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

We were very disappointed _____ the organization of the festival.

The dog ran .......... the house.

The boy is afraid (of/on/in/about) snakes.

I was delighted _____________ the present you gave me.

That is last year's telephone directory. It's .......... date now.

Plant and animal extinction leads _________ loss of biodiversity.

Since all vehicles were banned from the city centre, the air has been safe ........... pollution.

Oxygen, fuel, and hear are all necessary _____ combustion.

We were very doubtful .............. his ability.

Henry was born ........ 1992.

There were .......... 100 people at the meeting.

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

I'm very grateful .......... her ......... help.

His opinion is different _____________ mine.

Did Mr. Kennedy park his car .......... front .......... our house?

Your profession is similar (to/in/on/of) mine.

When ______ Rome do as the Romans do.

We areall aware____________ the importance of the environment protection.

They translated the letter ______ French.