_______ we clean the classroom atonce — No, you _______. You _______ clean it after school.

g on a frozen sports field sounds like a lot offun. Isn’t it rather risky, ____

Linda, please _________how to get there and the costof the trip.—All right. I’ll make it at once.

Zhangye has set up Qilian Mountain Nature Reserve，______ animals and plants can be protected well．

What ____________ you _____________ last weekend—I wrote some letters and read a book.