New light may be the cause of cancer by research that is now in progress．
| A．thrown | B．thrown off | C．thrown on | D．thrown by |
I’ve become good friends with several of the students in my school ______ I met in the English speech contest last year.
| A．who |
| B．where |
| C．when |
| D．which |
Between the two parts of the concerts is an interval, ______ the audience can buy ice cream.
| A．when |
| B．where |
| C．that |
| D．which |
She showed the visitor’s around the museum, the construction _______ had taken more than three years.
| A．for which |
| B．with which |
| C．of which |
| D．to which |
When deeply absorbed in work, ______ he often was, he would forget all about eating and sleeping.
| A．that |
| B．which |
| C．where |
| D．when |
Sales director is a position _______ communication ability is just as important as sales skills.
| A．which |
| B．that |
| C．when |
| D．where |