Didn’t   ever occur to you what the source of this saying I just quoted is?

We couldn’t take a bus to go home because _________ of us had any money in our pockets.

29. I have been absent for nearly half a month. I can't afford ________ week.

—Who helped Linda tidy up the bedroom just now?—_________. She cleaned it all by herself.

I found       difficult to make good friends with them.