This kind of CD-ROM is very popular. Why not buy one before it___________?A. comes out B is come out C. is sold out D. sells out
Betty hasn’t got __________ meat in the fridge.
I _______ like science but I think it is very useful.
–______ is your art Lesson? – It’s at 8:20 today.
We have no lessons________ Sunday.
The students found _______ easy to work out this maths problem.