The bus driver stopped _____ the passengers at the bus stop.

A. picking 　 B. picking up　 C. to pick up 　 D. to pick out

 The driver stopped the bus to _________ some old passengers on the way to the airport.

A. put up                   B. pick up            C. make up                   D. get up

I didn't notice that the bus had stopped to ______some passengers.

[　　]

A.get on   　　　 B.get off

C.pick up 　　　　D.pick down

Which of the following statement is NOT true?

1. A.
   He quickly picked up an old friend in the crowd.
2. B.
   After two years abroad, he picked up the language of that country.
3. C.
   The driver stopped the bus to pick up passengers.
4. D.
   He slipped and fell to the ground, but quickly picked himself up.