In order to make our city green, ____.
| A．it is necessary to have planted more trees | B．our city needs more trees |
| C．we must plant more trees | D．many more trees need to plant |
___________ and I’ll get the work finished.
| A．Have one more hour | B．One more hour |
| C．Given one more hour | D．If I have one more hour |
The harder you work at your lessons, the greater progress you ________.
| A．will make | B．make | C．have made | D．made |
--- She has been ill for a week.
----- I _____ with her at noon tomorrow.
| A．stayed | B．stay | C．am staying | D．shall be staying |
Students are often warned that anyone who leaves the classroom at night must remember to _____ all the lights, or he will be fined.
| A．switch off | B．go off | C．take off | D．bring off |
____ he was not rich enough to buy whatever he wanted, Edison decided to make his new laboratory the best.
| A．Although | B．Since | C．When | D．As |