_____________ does your cat weigh?— About 5 kilograms.

I usually sit_____ the classroom, so that I can hear the teacher who likes to stand_____ the class clearly. [ ]

I wonder why you don’t do it as ______ and it’s the third time you have done so.

Jack likes playing ______ chess, but he doesn’t like playing_______piano.

Mike，is this Tom’s pencil?—Oh，yes，it is ！