My MP4 player isn’t in my bag.–Where _____ you have put it?

The water in the river nearby will be dirtier than before if nothing __________.

Would you be ____ to lend me a hand?— No problem![ ]

My daughter lived in France for five years and now she’s working in a foreign company.—______is no wonder that she speaks such excellent French.

There are ______ people in the room, so it’s very crowded (拥挤的) .