The guide dogs make a big difference________the disabled in daily life.

On________Children's Day, Jack received a fine present from his parents.

A.a B.an C.the D./

A bird flew into the kitchen________the window.

A.through B.across C.above D.under

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

Huawei is one of the________companies around the world.

A.more successful B.most successful

C.more successfully D.most successfully

（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

— 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

In the past few years, many schools________the ways of doing morning exercises.

A.changed B.change C.will change D.have changed

I like watching the news. I hope to________what's going on around the world.

A.look for B.take care C.find out D.make sure

（2017﹒山东青岛）As a volunteer, the girl wants to visit sick kids in the hospital them up.

A.to cheer B.cheer C.cheering D.cheered