This is the old building ______ twenty years ago.[ ]

Sometimes smiles ______ be false, hiding other feelings like anger, fear or worry.

Will Guo Jingming’s new book ___________ in August this year? — Sorry, I’m not sure.

Everyone should play a part in _____the earth.

What do you think of ‘Eat-up’ Campaign (光盘行动)?–I think it’s really necessary. It is reported that the food that Chinese peopleevery year is enough to feed 200 million people for a year.