Could you tell me ______________ for class this morning?–I am sorry, Mrs. Lin. I got up so late that i couldn’t catch the first bus.

We all find ________dangerous to skate on the thin ice.

Could you tell me_________?—He is in the library．

Jenny arrived in Shijiazhuang ______ 7:10 _______ Tuseday evening. [ ]

Humans can’t live _______ air.—I agree with you.[ ]