The whole family still live in the house, most of _____ windows face south.

een writing this report ____for the last two weeks ,but it has to be handed it tomorrow.

Not only ______ to look after her children, but also _____ to work.

Thanks for your kind help! We would have_________ lost the game!

7.Although the causes of cancer ____， we do not yet have any practical way to prevent it.