The fleet made several expeditions _______ the exploration was stopped.
| A．when | B．before | C．while | D．since |
It is amazing that the little boy can swim ________the river ________100 meters in width.
| A．across; measuring | B．over; measured |
| C．across; measure | D．through; measuring |
According to the recent research, heavy coffee drinking and heart attack is not necessarily ______ and effect.
| A．reason | B．influence | C．fact | D．cause |
What ________surprise you gave us by wearing such funny________ at so serious a meeting!
| A．/;clothes | B．a; cloth | C．a; dress | D．a; clothes |
--- How about the debate held in your class?
--- ______
| A．Why ask? | B．Sounds great! |
| C．It was really hot! | D．I am really looking forward to it. |
Knowledgeable as he is, the expert was unwilling to offer advice to ______ he thought was not qualified.
| A．whoever | B．who | C．whom | D．which |