找出不同类的单词，并将其字母编号写在前面的括号里。
（1）A.pen B.tail C.ruler
（2）A.tired B.bored C.visited
（3）A.them B.him C.he
（4）A.teacher B.older C.taller
（5）A.on B.an C.in
（6）A.went B.got C.when
（7）A.first B.four C.fifteen
（8）A.tiger B.dog C.do
（9）A.when B.can C.what
（10）A.usually B.often C.off
( ) Is the cat ________ the door? No, it isn’t. It’s ________ the desk.
| A．behind, under | B．in, on | C．under, at | D．over, behind |
( ) If I ____ you tomorrow, I will give you the receipt.
A. see B. will see C. am seeing
( )—— What day is today? —— It's _____
A. Monday B. a fine day C. September 1st
( )The students couldn't help ______ when they heard the joke.
A. to laughB. laugh C. laughing
( ) Do you know ______ this word?
A. what to spell B. how to spell C. to spell