用所给动词的适当形式填空。 1. My father enjoys _____ (read) newspapers before breakfast. 2. Listen! Can you hear someone _____ (sing) in the next room? 3. I often help my mother _____ (clean) the house. 4.It’s easy to stay _____ (health) 5.He started _____ (learn)to ride a bike 5years ago.