______, the car stopped all at once.
| A．Seeing a boy lying on the ground |
| B．On seeing a boy sitting on the road |
| C．The driver saw a boy standing on the road |
| D．The minute the driver saw a boy seated on the road |
Sitting alone by the window, all the memories __________ .
| A．clouded in | B．clouded with | C．crowded in | D．crowded with |
The other day, when I was wandering in the street I ________ one of my old friend, Jim.
| A．came over | B．came across | C．came up to | D．came around |
Though we spent a lot, we think it _____ because we succeeded in the end.
| A．worth | B．worth being spent | C．worthy of | D．worthwhile |
The conference has been held to discuss the ________of global warming on people’s lives all over the world.
| A．importance | B．effects | C．protection | D．impression |
At the railway station，the mother waved goodbye to her daughter until the train was________.
| A．out of sight | B．out of reach | C．out of order | D．out of place |