Should it be the first time you ________ money with your dream?[ ]

ost their way in the forest,and . Which of the following is wrong

The number of people invited ____ fifty, but a number of them ____ absent for different reasons.

I can’t find Mr. Smith. Where did you meet him this morning?—It was in the hall ____ our products were showed..

I’ll be home late, but please don’t for me. You’d better go to bed first.