________ you know little about protecting yourself against the novel coronavirus (新冠病毒), you'd better search for more information about it online.
A.Unless B.Since C.Though D.Whether
A primary school in England has ________ signs at its three entrances, saying, "Greet your child with a smile, not a mobile."
A.put out B.put up C.put in D.put on
—Will Jim come to your son's birthday party tomorrow afternoon?
—He ________ come, but it depends on whether his work will be done by then.
A.may B.should C.must D.need
—The apples are quite sweet! Can I have one more?
—Sorry, there is ________ left. What about some oranges?
A.no one B.nothing C.none D.nobody
—Don't make any important decisions, ________ when you are in such a bad mood.
—Don't worry. I won't.
A.simply B.exactly C.certainly D.especially
—What are you doing?
—I am reading a story about a scientist. He is well ________ for his contribution to Chinese medicine.
A.enjoyed B.expected C.behaved D.respected