根据句意和汉语注释，写出单词的正确形式。______________(百万) of people live in the beautiful city now.
--Whose car is it?-- Oh, it’s one of the _______________ （邮递员）cars.
I can’t find my _________________(钥匙). I put them somewhere in the room.
After walking for three hours, all the students are ____________(相当，非常) tired.
The CN Tower is 1,815 _____________(英尺) tall.