You’d better leave the key at home __________ one of us should think of coming back.—Why? Is your key lost? [ ]

You _______ be tired—you’ve only been working for an hour.

d me his computer company was in great need of acapable leader, ______ with strong will as well as good humor.

Look out! The ceiling _____ l down

I will mark ______ everything you say.It is helpful to the English learners