It’s very kind _____ you to help me carry the boxes since it is difficult ______ a person like you to carry so heavy things. [ ]

There are ________ people in the supermarket. It’s so crowded.

This is not an economical way to get more water; ____, it is very expensive.

Great! They have shirts_____many colors_____$10 each．[ ]

I want to buy a nice present _____ my mother and I must give it _____ her myself.[ ]