How can you expect to learn anything ______ you spend all your time playing computer games?

Many of them turned a deaf ear to his advice ______ they knew it to be valuable.

--- Can you tell me how to improve my English? --- Do more speaking, I think , ________you will be good at spoken English.

All the economists are working on　　　the financial crisis can be prevented, which has caused a huge loss throughout the world. 

---- Could I take a few days’ leave, sir?----- I’m afraid you can’t ___________ the work is being done.