Health problems are closely connected with bad eating habits and a _____ of exercise.
| A．limit | B．lack | C．need | D．demand |
We shall go_____we are free.
| A．whenever | B．whatever | C．wherever | D．however |
It was not long_____ he got to know it.
| A．when | B．before | C．after | D．until |
It is five days_____ we came here.
| A．when | B．before | C．as | D．since |
I have not seen him_____ he went to college.
| A．when | B．before | C．as | D．since |
They did not stop fighting_____ there was no enemy left.
| A．until | B．after | C．when | D．since |