---Dad, must we wait until the light becomes green?---Yes, I’m afraid we ______. That’s the traffic rule.
Look! There are five planes _______ in the sky.
There are _______visitors here every day.
---Would you like to help me? --- Sure, _______.
There is _______milk in this glass than in that one.
—What did you buy _______ yesterday morning? —I bought _______umbrella.