Sam spends two hours _______ his homework every day.

I don’t know if Mr. Li ____ to the party this evening.– I think he will come if he ____ free.

Lily, there is _________ schoolbag near the window. Is it yours?—Yes, it is. Thank you!

I’m going to stay in my uncle’s for .

The earthquake in Japan, measuring 9.0 on the Richter Scale, was so violent cause a series of explosions of the nuclear reactors in several power stations.