It’s very late at night, ____ our teacher is still working .
(浙江杭州)My cousin went abroad at________age of eighteen.
There are________many students on the playground.I can hardly find Tom.
—Excuse me.what’s this for? —It’s a cleaner and it________to pick up dirt.
We believe scientists will________a way to solve the air pollution.
Could you________the restaurant and order sortie take-away food for me?I’m a little hungry.