A 7-year-old boy received an operation on Tuesday successfully _______ he has many other health problems.

——Did Tom come back late last night?——No. It was not yet 8 o’clock ____ he arrived home.

Mary passed the driving test,_____ surprised everyone in the office.

There were some chairs left over _____ everyone had sat down.

— The pop group S.H.E is said to have been invited to 2013 CCTV Spring Festival Show.— Really? It’s a long time _______ they three performed together on the mainland.