We were very grateful _________ our friends for all of their assistance.

We congratulate you ___________ your successful flight.

If you don't know the meaning of the word, look it __ in the dictionary.

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

Opening the parcel, hewas surprised ____________ what he saw.

She was very surprised ________ the grade she received.

He always prevents me_______ doing my duty.

We have been learning English_____________ five years.

Thank you very much _____ what you have done for me.

He wore a hat, which made him look _______________ a spy.

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

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

Plant and animal extinction leads _________ loss of biodiversity.

He’s getting bored_____________ learning_____________ heart.

Aren't you glad that you went to the party with us .......... all?

I’m going away .......... the end of February.

I write letters _______ my right hand.

We are present (at/in/to/of) the lecture yesterday.

I shall meet you _____ the corner _____ the street.

What time did they arrive ......... the hotel?

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