用括号内所给单词的适当形式填空。 1. My mother goes to Beijing _________ (two) a year. 2. Thanks a lot for _________ (teach) us so well, Miss Green. 3. He would like _________ (have) a cup of tea. 4. Today is Tom's _________ (fourteen) birthday. 5. You should exercise to stay _________ (health). 6. My father _________ (buy) some DVDs for me yesterday. 7. How many _________ (mile) is it from your home to your school? 8. Taking a boat must be a lot _________ (much) fun than taking a bus. 9. Thanks for your _________ (invite) to your house next week. 10. You should help your sister when she _________ (need) help.