_________ volunteers will give out leaflets to ask people to protect the wetlands.
I didn’t understand ______, so I raised my hand to ask.
We still gave the boy another chance ______he made some mistakes.
You can never imagine the great difficulty I had ______ her QQ number.
Yunmeng Mountain _______lies in the south of Hebi attracts the visitors both at home and abroad.
The boy ______ a piece of waste paper, and put it into the rubbish bag.