You can wait here.I think he is ( )back before 7:00 A.going

I think we must wait here ____ he comes back.填until还是before? Please wait a moment.I think he can __ here soon. but i don't think you can smoke here.I didn't know this is a 单项选择 并说明理由1 I will wait here until he __ back.A will wait B 1.I __ (wait) until he comes back.2.Can you tell me if it __ ( )I will be back in a minute.You have to wait here for _. I think you can find a j( ) here I can't wait until he gets here I don't think he is a person you can ___ for help. （B）I'll wait for you come back.A since B until C before D af Must I wait till he comes back No,you( ). （ ）11.Please wait here _______I come back.A.before B.until C