Jack has been feeling down recently . I wonder that is making him so upset .
| A．what is it | B．why is it | C．why it is | D．what it is |
_____ the catastrophe happened that the local government realized the importance of substantial development.
| A．It was until | B．Not until | C．Until | D．It was not until |
—There will be a talk show this time tomorrow．Would you go with me?
—I'm sorry, but I ______ an important meeting．
| A．have attended | B．will be attending |
| C．am about to attend | D．will attend |
______ is known to us all , the old scientist,______ life was hard in the past, still works hard in his eighties.
| A．It; whom | B．As; whom | C．As; whose | D．What; whom |
The ______ flights between the mainland of China and Taiwan will benefit more travelers.
| A．common | B．normal | C．average | D．regular |
Oh, I’m not feeling well in the stomach. I ________ so much fried chicken just now.
| A．shouldn’t eat | B． mustn’t have eaten |
| C． shouldn’t have eaten | D． mustn’t eat |