This kind of CD-ROM is very popular. Why not buy one before it___________?
A. comes out B is come out C. is sold out D. sells out
You shouldn’t ________ here. The baby _____.
| A．play; sleeping |
| B．to play; is sleeping |
| C．plays; sleeps |
| D．play ; is sleeping |
Scientists can make the robots __________.
| A．to dance | B．dance | C．dancing | D．danced |
There will _________ robots in people’s homes.
| A．be | B．are | C．have | D．has |
The boy is _______ to look after himself .
| A．enough old | B．enough young | C．old enough | D．young enough |
—Will people live to be 300 years old?— ______________.
| A．No, they aren’t | B．No, they won’t |
| C．No, they don’t | D．No, they can’t |