It is not a problem ______ we can win the battle；it's just a matter of time．（ ）
| A． |
whether |
B． |
why |
C． |
when |
D． |
where |
_________ to too much sunlight will do harm to your skin.
| A．Having exposed | B．Being exposed |
| C．To be exposed | D．Exposed |
（）There is no greater pleasure than lying on my back in the middle of the grassland, _____at the night sky.
| A．to stare | B．staring |
| C．stared | D．having stared |
__________ the program , they have to stay there for another two weeks.
| A．Not completing | B．Not having completed |
| C．Not completed | D．Having not completed |
What worried the child most was _______ to visit his mother in the hospital.
| A．his not allowing |
| B．his not being allowed |
| C．his being not allowed |
| D．having not been allowed |
Clearly and thoughtfully________, the book inspires confidence in students who wish to seek their own answers.
| A．writing | B．to write |
| C．written | D．being written |