【题目】I guess someone is k________on the door.

【题目】Do you s________the floor every day?

【题目】--I wonder _____. -- Through “Didi”. It is easy.

【题目】--Mom, could I have a new computer?-- ___. We don’t have enough money.

【题目】The self-service supermarket___ young people in big cities.

【题目】She s________watches TV in the evening because she has a lot of homework to do.

【题目】Stephen Hawking ____ wrote A Brief History of Time(时间简史)is a great British scientist.

【题目】--I hope the math problems won’t be difficult. --- If you prepare well, you can work them out _.

【题目】-- Excuse me, may I come in? -- sorry. Please wait on your chair ___ your name is called.

【题目】We like doing a lot of after-school a________, such as playing basketball and football.