用所给单词的适当形式填空。 1. —Can you _____ (come) to my house for dinner? —Sorry, I can't, I have to _____ (help) my parents at home. 2. Thank you for _____ (ask) me to your birthday party. 3. He is trying _____ (go) out, please_____ (help) him _____ (open) the door. 4. Do you want _____ (go) _____ (swim) with us Saturday afternoon? 5. Would you like _____ (come ) to my office _____ (discuss) the report? 6. Do you often practise _____ (play) soccer after school? 7. His _____ (America) friends would like to visit China during their vacation. 8. They are having two _____ (concert) at this time of year. 9. Lesson Twelve is the _____ (twelve) lesson. 10. It's good for our health _____ (have) football training.