Shall we go out for a swim?—Sorry, I can’t. I ______ housework for my mother now.

______ came that Prime Minister David Cameron（卡梅伦首相） blamed the worst riots（骚乱）in Britain the other day.

When shall we meet again?–Make it____ day you like. It’s all the same to me.

They found ­_______very hard to move the stone.

Can you understand my words? — Sorry, I can ______ follow you.