our earth, or else it will be no longer fit for us to live on.
| A．Protected | B．To protect |
| C．Protecting | D．Protect |
相关试题
Please go _________the ship quickly. There is only fifteen minutes left.
| A．on the board | B．to aboard | C．on aboard | D．Aboard |
----- Did you visit her while you _____ in New York?
----- I _____ to, but I was extremely busy.
| A．stayed; was intending | B．was staying; intended |
| C．was staying; have intended | D．stayed; had intended |
John, look at the time. __________you play the piano at such a late hour?
| A．Must | B．Can | C．May | D．Need |
The new laws___________reducing the heavy traffic have come into___________.
| A．aiming at ; use | B．are aimed at; effect |
| C．aimed at; affect | D．that are aimed at; effect |
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