Two middle-aged passengers fell into the sea. ____, neither of them could swim.
A. In fact B. Luckily 
. Naturally D. Unfortunately
—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 |
His humorous closing speech was a welcome addition to the ______dull meeting．
| A．therefore | B．meanwhile | C．otherwise | D．thus |