Zhang Hua is clever and works hard at his lessons. __________ .

If the traffic light is red. You can’t walk _____ the road. [ ]

_____ ! The bus is coming. — Oh, no. It’s too dangerous to cross the street now.

What’s the matterMr. Liu? He is wet through. —His car ranthe river, for he drove his car after drinking lots of beer. [ ]

It may take _________ years to make such robots .