The question is ______ it is worth doing.
| A．if | B．whether | C．which | D．what |
He formed a good habit from his childhood, ________ a lot of useful knowledge.
| A．remember | B．to remember | C．remembering | D．remembered |
When the students heard the alarm, they all hurried to they thought was an emergency exit door．
| A．what | B．which | C．where | D．who |
— Have you told Mary the good news that she was admitted into Shandong University?
— Yes. I told her ________I saw her this morning.
| A．while | B．the moment | C．until | D．suddenly |
—Your colleague's spoken English is quite good, Amy．
— No wonder, as she in the USA for two years．
| A．worked | B．has been working | C．had worked | D．has worked |
— We expected you yesterday．
— I'm sorry, I you to say that I couldn't be here until today．
| A．must have called | B．would be calling |
| C．could have been calling | D．should have called |