1) jack has gone away . He will be away — next Friday
A on.                      B until.                   C for
2) Ba  took a lot of plotos —  the visit to huong pagodo 
A at.                        B during.               C in
3) they had to wait at Ben Duc — a long time
A. Since.                 B for.                     C during
4) liz  went to bed early — she was tired after the trip
A but.                       B because.            C so