---Mike must have known that.
---No, he ________. How _______ he?
| A．mustn’t, must | B．may not, might | C．couldn’t, can | D．needn’t, need |
There is _____ what the weather will be like.
| A．not knowing | B．no knowing | C．not know | D．no known |
I am too glad _____ you.
| A．to see | B．seeing | C．saw | D．at seeing |
The Arctic is considered _____ the northern part of the Atlantic.
| A．having been | B．to have been | C．to be | D．being |
_____, the boy couldn't enter his house.
| A．Since the key had lost | B．The key being lost |
| C．Lost the key | D．Having lost the key |
_____ in white, she looks much more beautiful.
| A．Wearing | B．Dressing | C．Dressed | D．Having dressed |