Sex education is a sensitive area for some parents, and thus it should remain _________.
| A．random | B．previous | C．optional | D．vital |
________ entered the classroom ________ the bell rang.
| A．We hardly had; before | B．Hardly had we; when |
| C．Hardly had we; than | D．Hardly did we; when |
— Did you remember to give Jenny the money?
— Yes. ________ I saw her, I’m sure.
| A．As far as | B．In case | C．The instant | D．Now that |
______ their homework, these three students have to stay in the classroom for another thirty minutes.
| A．Not finishing | B．Not finished |
| C．Having not finished | D．Not having finished |
When ________ what made him a popular person, he said it was his personality.
| A．asking | B．asked | C．being asked | D．ask |
________ its low price, the advantage of this car lies in its good quality.
| A．According to | B．Different from | C．Apart from | D．Due to |