( ) The students couldn’t help ________ when they heard the joke. A. to laugh B. laugh C. laughing
与tenth相邻的数字是哪一个? A.nineth B.thirteen C.seventh
小写字母占三格的是下面哪一个字母?A.f B.h C.k
There ______ no treest.A.were B.has C.was
Ann didn’t______a friend yesterday.A.visited B.visit C.visiting
What______you do last night? A.did B.does C.are