Many birds are out of ____________ now, because we have done a lot of things to protect __________ birds.

What did your daughter say in her letter? — She told me that she ________ Cambridge University already with her friends.

Listen ! Helen is singing in the next room.—It _______ be Helen. She has gone to Beijing.

Tomorrow is our holiday. What _____ going hiking? — That sounds great. [ ]

Would you mind closing the window to stop the wind _______ the papers away.