----It’s too hot. Would you mind ________ the door?
----________. Please do it now.
| A．to open; OK | B．opening; Certainly not |
| C．opening; Of course | D．to open; Good idea |
This pencil is___ than that one.
| A．as long | B．longest | C．long | D．longer |
You should study harder______ it is too late to catch up.
| A．if | B．when | C．after | D．before |
Tell the boy the news. He is ______to understand it.
| A．enough old | B．enough young | C．old enough | D．young enough |
Class is over. Let’s stop______ a rest.
| A．having | B．to have | C．had | D．have |
--- _________ difference the day made! We were very happy.
| A．what | B．how | C．what a | D．how a |