With credit cards ________ available, it is more frequent to see consumers pay for their purchases or bills by card instead of by cash.
One of our rules is that every student ________ wear the school uniform while at school.
—Why does Thomas speak through every discussion but never listen to the others? —That's what he ________ do. We used to hate that, but are used to it now.
________ the arrival of the police, I would have been robbed by two masked men.
I know that it will be difficult to pick him out in such a crowd, but if you ________ happen to see him, give him this packet.
She didn't come to the party last Sunday. ________, she must have made the party more exciting.