备用刹车的液压源是

Can you tell me when     （）       back ?

Could you tell me        （）   you have bought this fur coat?

I wonder how much   （）        .

The reason why he was late was   （）        he had taken a wrong bus.

The truth is      （）   he doesn＇t work hard enough.

The reason for his success is        （）          he worked hard.

The problem is not （）        we leave, but  （）         we can get there.

It looks    （）           it＇s going to rain.

This is   （）            .

The news  （）    Lincoln was murdered filled the American people＇s hearts with deep sorrow.