He did well in the examination. He _____ hard at his lessons..
| A．must have worked | B．can have worked |
| C．will have worked | D．has worked |
_______ that he was in great danger, Eric walked deeper into the forest.
| A．Not realized | B．Not to realize | C．Not realizing | D．Not to have realized |
_____twice, the postman refused to deliver our letters unless we chained our dog.
| A．Being bitten | B．Bitten | C．Having bitten | D．To be bitten |
We are invited to a party______ in our club next Friday.
| A．to be held | B．held | C．being held | D．holding |
Tony was very unhappy for ______ to the party.
| A．having not been invited | B．not having invited |
| C．having not invited | D．not having been invited |
____ to hospital in time, the wounded soldiers were saved at last.
| A．Taken | B．Taking | C．Having taken | D．Being taken |