In a few years' time,there will be ( ) tree on the mountain.
A、a hundred of B、a hundreds C、hundred of D、hundreds of
The Internet makes it （ ）for us to send information to each other in a few seconds.
A、possible B、necessary C、impossible D、important
People will use robots（ ） the housework in the futurn.
A、do B、to do C、doing D、to doing
The old man （ ）to have known the good news.
A、needs B、wants C、seems D、souds