HOMEWORK: : Fill in the blanks with correct forms of the modal verbs.1 在做了很多工作之后，你一定很累了。You ________ be very tired after doing much work.2 他现在不可能在家。He ________ be at home now.3 不要玩火，你可能会烧伤自己。Don’t play with the fi re. You ______ burn yourself.4 我们不能摘花。We _______ pick the flowers.5. You _____ as well just say yes.你还不如答应了呢。6. _________ he dance when he was 9?他九岁时能跳舞吗？7. Can I open the window? 我能开窗户吗？Yes, you _________ . 是的，可以的。8. Where ______ you been to last night?你昨晚到底去哪儿了？9. Must they go now? 他们必须现在离开吗？Yes, they ________. 是的，必须。10. We __________ have picked him up_. He has a car.我们本不必接他的，他有车。