Is this the reason ________ at the meeting for his carelessness in his work?
| A．explained | B．what he explained |
| C．how he explained | D．why he explained |
He has some doubt ________ he will succeed in his research work.
| A．whether | B．weather | C．which | D．that |
_________ is known to all, the moon travels round the earth once every month.
| A．It | B．As | C．That | D．What |
Sorry, I am late. I ______ have turn off the alarm clock and gone back to sleep again.
| A．might | B．should | C．need | D．would |
___________ was most important to her, she told me, was her family.
| A．It | B．This | C．What | D．As |
The man _______ the little boy and said , “You are so clever and lovely . I love you very much.”
| A．glared at | B．aimed at | C．stared at | D．laughed at |