I’m not sure exactly how much money you’ll receive, but it will ____ cover your major expenses.

He’d like to sleep with the window ＿＿＿＿ at night. 

 I can't believe what he says because he is _______ changing his mind. .

--- In what way will you use your portable computer?--- I’ll use it _____ for giving lectures at home and abroad. 

 We have planted thousands of trees in recent years. This year _____ we’ve planted ten thousand trees.