When you are sleeping, you had better______ all the windows closed.
Dave has few friends here, so he often stays at home so he often feels
______is difficult to______ others.
Susan borrowed some books from me, but she forgot to ______them to me.
We decided not to climb the mountain because it was raining ______
--- I don’t know if it _____ ____ tomorrow.--- Well, if it _______, we won’t go for a picnic.