Do you know when Britain________war on Germany during the Second World War?—In 1993，I suppose.

The traditional view is ________ we sleep because our brain is “programmed” to make us do so

I am not sure if she________me to her party. If she________me, I will be pleased..

afraid this pair ofshoes is a little expensive—If you really want to buy them, I will give youa ____ of 10 percent

_____to nuclear radiation, even for a short time , may produce variants(变异体) of genes in human bodies.