1 the guard asked the passengers to back away/
down from the edge of the train platform.
2 the school carried on/out a fire safety drill.
3 despite his accident, he carried on/out climbing.
4 back up/out your computer files regularly.
5 the match was called off/back due to heavy rain.
6 she backed down/out of the race in the end.
be
3 is
ab
4 la
2
10.6.14 choose the correct preposition.