13. In any case, parents should make clear _______, if any thing, the children are expected to pay for with the money.
It was __________ back home after the experiment .
She didn’t come to the party last Sunday. __________, she must have made the party more exciting.
— Are you going there with us? — If Mary wants to go, __________.
The teacher told us to remain silent unless _____.
— Do you think it is going to rain over the weekend? — __________.