We have made up our minds that we’ll go to Wales for our summer vacation, but we still have not ___________________ when we’re going.
| A．organized | B．expressed | C．settled | D．performed |
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 |
I was about to leave my house _____the phone rang.
| A．while | B．when | C．as | D．after |
_____ we were singing, the teacher came in.
| A．Before | B．after | C．As | D．Until |