【即学即练】 用just,already,yet填空:
(1)They’ve ________seen the film twice.It’s wonderful.
(2)David has ________come back from New York.
(3)Mum,I’ve _________finished my homework.Can I play football?
(4)They’ve __________heard the news.Now,they’re talking about it.
(5)Xiao Ming hasn’t returned __________.His mother is angry.
(6)Have the students found the lost dog _______?
(7)No one from other planets has sent us a message________.