from the moon, our earth, with water seven percent of its surface, appears as a “blue ball”.
| A．Seeing…covered | B．Seen…covered | C．Seeing…covering | D．Seen…covering |
The old scientist used to say that knowledge ______ from practice．
| A．was coming | B．comes |
| C．had come | D．would come |
A person _____e-mail account is full won’t be able to send or receive any e-mails．
| A．who | B．whom |
| C．whose | D．whoever |
In the last few years, China ____ great achievements in environmental protection．
| A．has made | B．had made |
| C．was making | D．is making |
_____ the early flight, we ordered a taxi in advance and got up early．
| A．Catching | B．Caught |
| C．Catch | D．To catch |
It is the third time that she has won the race, ______ has surprised us all．
| A．that | B．where | C．which | D．what |