Mrs. Smith finds it hard to clear up the mess, as her children are alwayswhenever she tries to.
| A. | in the way | B. | on watch | C. | in sight | D. | on the line | 
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 |