Fill in the blanks with the suitable conjunction:
He had to retire _____ of ill health.
as
so
because
when
Walk quickly _______ you will be late.
or
He was angry _____ he heard what happened.
That was years _____ years ago.
until
unless
and
We will go swimming next Sunday _______ it's raining.
We were getting tired _____ we stopped for a rest.
but
This drug has serious side effects ________ its sale has been banned.
I would like to go _____ I am too busy.
for
I heard a noise _____ I turned the light on.
Samir is worried ______ he is late for an important meeting.
although
