______ regular exercise is very important, it is never a good idea to exercise too close to bedtime..
I'd like to go swimming ____ the water is not too cold.
It’s quite me why such things have been allowed to happen.
I can't use your pen, ___ there is no ink in it.
My sister was against my suggestion while my brother was_________it.
Things have changed a lot ____ I wrote to you last time.