正确答案为：
It's 11 o'clock now and they have (already ) had lunch.
Come s quickly as ( possible ),please.
Light traels faster than (sound )
It will be ( upset ) for her to have no news of her family.
I saw the whole accident with my ( own ) eyes.
She'll be famous singer ( one ) day
They think taht ( robots )will be able to talk to people in 25 to 50 years
Wenever know what will ( happen )in the future