—Hey, Jack. Waste paper mustn’t ________ here.
—Sorry, I won’t do that again.
| A．throw | B．be thrown | C．be throwing | D．to throw |
Our English teacher came into the classroom____some books.
| A．on | B．with | C． at | D． to |
Teenagers should be allowed out on school nights.
| A． going | B．to go | C．gone | D．went |
Tim doesn’t study ____as his sister does .
| A．very hard | B．harder |
| C．so hard | D．hard enough |
Excuse me! Can you tell me____next?
| A． how to do | B．what should we do |
| C．what we should do | D．how we should do |
This book is ___hard ___understand.
| A． too ; to | B． such; to |
| C． too ; too | D． so ; that |