The teacher said that they ______ hard-working students.

What do you think of haze(雾霾)？ —- It ____ us we all must try to do something to stop the air pollution.

Please don’t park your car ______ our house. [ ]

My brother is ____ years old．Today is his _____ birthday．

Excuse me, have you seen ________ lovely cat?—Is it ________ black cat? Just now I saw it sleeping under the table.