In the past few years, many schools________the ways of doing morning exercises.
A.changed B.change C.will change D.have changed
— Must I hand in my book report today, Mr Brown?
— No, you .The book report is due in two weeks.
A.can't B.mustn't C.shouldn't D.needn't
（2017年山东泰安）I didn’t believe I could do it ____ I got to the top of Mount Tai.
A. unless B. until C. after D. as
Huawei is one of the________companies around the world.
A.more successful B.most successful
C.more successfully D.most successfully
It's best to stay indoors________at the time of the outbreak of the coronavirus(新冠).
A.exactly B.possibly C.especially D.generally
A bird flew into the kitchen________the window.
A.through B.across C.above D.under
