根据句意,用括号内所给的适当形式填空。 1. I like P.E. best. Because my P.E. teacher is very _____ (friend) to us. 2. Peter and Tom always go _____ (swim) in summer(夏天). 3. All the books are on these _____ (shelf). You may go to find the book you want to borrow. 4. Jenny likes _____ (learn) Chinese, because it's easy. 5. Why not _____ (clean) your bedroom and go to bed? 6. We all like history, because we can know about many _____ (story).