Tom, clean up the broken glass _________ someone walks on it.
—Is the money your parents give you enough?—No, I have to have a part-time job to my school expenses.
A computer can’t remember who ; it simply does what .
Emergencies and unexpected situations happen all the time.
While watching television, .
The rising frequency for smoggy days puts me into deep that maybe one day citizens will have to rely on masks to survive.