When the clock __________ twelve o’clock, Cinderella suddenly remembered her godmother’s words and rushed away from the prince.
-Don't forget to return the book in two weeks. -__________. Don't worry about it.
Do remember to go to his birthday party on time __________ you've promised to.
A technology company will die soon if it can't __________ to the market fast enough.
We should follow the __________ in a foreign country we are visiting.
__________ our earth, or else it will be no longer fit for us to live on.