【正文】
do 。 done 。 studied D . are 。 better D . changed 。 Both his parents look sad . Maybe they _________what39。s happened to him . A . knew B . have known C . must know D .will know I _____this book for two weeks, I have to return it now. A borrowed B have borrowed C kept D have kept Have you met Mr. Li ______? A . just B . ago C .before D . a moment ago The famous writer _____ one new book in the past two years . A . is writing B .was writing C .wrote D .has written — Our country ______ a lot so far . — Yes . I hope it will be even ______ . A . has changed 。 better Zhao Lan ______already ______in this school for two years . A . was 。 studying We ______ Xiao Li since she was a little girl . A . kno