—I remember I ______my bag somewhere around here.—Really? I never saw it.
| A．left | B．leave | C．was leaving | D．had left |
It was with the help of the local guide ________ the mountain climber was rescued.
| A．who | B．that | C．when | D．how |
Not once ________ to Michael that he could one day become a top student in his class.
| A．occurred it | B．it did occur | C．it occurred | D．did it occur |
The traffic on the main streets has a longer green signal than______ on the small ones.
| A．one | B．this | C．that | D．it |
People develop ______ preference for a particular style of learning at ______ early age and these preferences affect learning.
| A．a; an | B．a; 不填 | C．不填; the | D．the; an |
It was only a very short time _______ the young lady found her cellphone stolen as she got on the crowed bus.
| A．before | B．when | C．since | D．after |