—Look! A book is on the floor. Whose is it?
—It ______be Rick's. It has his name on it.
| A．mustn't | B．can't | C．must | D．need |
– May I take the magazine out of the reading room?
-- No, you can’t. You read it here. It’s the rule.
| A．might | B．would | C．may | D．must |
Everyone went to the zoo last Sunday ______Jim.
| A．but | B．not | C．except | D．besides |
____ will he be back?
In a week.
| A．How long | B．How soon | C．How often | D．How many |
If you miss so many lessons, you must fall behind ____ classmates.
| A．another | B．the others | C．other | D．the other |
I found _____ very difficult to learn maths well.
| A．what | B．it | C．that | D．this |