几道英语时态填空
1.He doesn't know a thing about the verbs,for he ________his lesson.
(not study)
2.Don't interrupt him when he ______(work)
3.At this time tomorrow she _______a history exam.(have)
4.When she heard the news,tears______ in her beautiful eyes.(appear)
5.This time next month i ____on a beach.(sit)
6.The postman knows what hid duty _____.(lie)
请附上理由,