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— Who do you think should answer for Li Tianyi’s behavior?
— Actually, I think it is their parents_________.

He used to be a successful businessman, but drug ____ his ruin.

At the meeting, the old man ________ some good advice about bringing down the market price of housing.

It is nice to hear from a close friend. ________, we last met more than thirty years ago.

Do you have any difficulty ________?

After the earthquake, the president _____ a three-day period of mourning, the first-ever event of its kind for ordinary people.

Having lived in China for 8 years, Helen has a good ____________ of both English and Chinese.

We had a big meal in a fine restaurant last Monday and the total cost ____________ $500.

Whether by accident or ___________, he arrived too late to help us.

The Group of Eight (G8) ______ the richest eight countries in the world.