—Please go on with your demonstration.—But where was I?—Well, you_____the two chemicals together.
.I won’t call you, __________ something unexpected happens.
. He was told that it would be at least three more months __________ he could recover and return to work.
.Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.
. Leave your key with a neighbor __________ you lock yourself out one day.
The news about the terrible flood there greatly discouraged __________ there for sightseeing.