---The light in the room is still on. Do you know_______?---In order to prepare for the coming exam.
We really don’t know _________ with our problems in learning English.
They were walking ________ a forest after they swam _______ the river .
_______should not be allowed to get ears pierced.
What would you do if you had _________ dollars ?
Jimmy is _________one-year-old boy and he has_________8-year-old sister.