摘要： Is the light ?
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The light bulb ______ by Edison in the middle of the 1780s.
| A．is invented | B．was invented | C．invented | D．invent |
The light ____ red. You ____ cross the road.
| A．are, can | B．is, cannot |
| C．are, can not | D．is, must |
---The light in the room is still on. Do you know_______?
---In order to prepare for the coming exam.
| A．if he works hard | B．why he stays up late |
| C．why is he so busy | D．when he will stop working |