请用所给的正确形式填空。 1. I __________ to the library on Sundays. I __________ to the library yesterday. (go) 2. She often __________ Miss Zhang. She __________ Mr. Wood yesterday. (see) 3. Jenny __________ her homework every day, but she didn't __________ her homework yesterday. (do) 4. Danny __________ __________ checkers now. Yesterday he __________ with a ball. (play)