1 . Every solid object will reflect a sound，__________ （vary）according to the size and nature of the object．(所给词的适当形式填空）

2 . He went out of the room with few clothes on, only          rather cold.

A．to feel

B．feel

C．feeling

D．felt

3 . ________enough preparations，they thought it better to put off the trip till next week.

A．Not making

B．Having not made

C．Not having made

D．No made

4 . The problem ______ now is very important.

A．being discussed	B．discussed
C．discussing	D．to be discussed

5 . You can’t imagine what great trouble we have ________________ the problem ___________.

A．to solve; being talked about	B．solving; talking about
C．to solve; to talk about	D．solving; being talked about

6 . _______ almost all our time to our schoolwork in the past three months, we have almost no time for fun and play．

A．Having devoted	B．Devoted
C．To devote	D．To have been devoted

7 . ____that she didn’t do a good job, I don’t think I am abler than her.

A．To have said	B．Having said
C．To say	D．Saying

8 . __________ 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

9 . -Any danger for the patient     on by Dr．Smith?
- Hard to say．Doctors are trying their best．

A．to operate	B．being operated
C．to be operated	D．operating

10 . ____ again and again, the sayings have been learned by heart so far.

A．Being practised	B．Having been practised
C．Practising	D．Having practised