________ I accept that he is not perfect, I do actually like the person．

A．While

B．When

C．Since

D．Unless

It was foolish of you to take a taxi ________ you could easily walk there in five minutes．

A．when

B．while

C．before

D．unless

(经典回放)The visiting minister expressed his satisfaction with his tacks, ________ that he had enjoyed his stay here．

A．having added

B．to add

C．adding

D．added

The old man, ________ abroad for twenty years, is on the way back to his mother land．

A．to work

B．working

C．to have worked

D．having worked

The athletes stood, ________ their national flag ________．

A．seeing; raised

B．watching; being raised

C．looked at; rising

D．noticing; rising

While shopping, people sometimes can't help ________ into buying something that they don't really need．

A．to persuade(说明)

B．persuding

C．being persuaded

D．be persuaded

His silence suggested ________ to the plan．

A．his not agreeing

B．he not agree

C．he didn't agree

D．his not to agree

________ a little money, Jane was able to buy her mother a lovely new watch．

A．To save

B．Saving

C．Saved

D．Having saved

(经典回放)The research is so designed that once ________ nothing can be done to change it．

A．begins

B．having begun

C．beginning

D．begun

Unless ________ to speak, you should remain silent at the conference．

A．invited

B．inviting

C．being invited

D．having invited