________ he is ,he seldom shows his precious coins to others.
| A．Coin -collector as | B．As a coin -collector |
| C．A coin- collector as | D．Coin- collector that |
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 |
Though ________ money, his parents managed to send him to university.
| A．lacked | B．lacking of |
| C．lacking | D．lacked in |
The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun |
| C．beginning | D．begun |
“What do you think made Mary so upset?” “_______ her new bike.”
| A．As she lost | B．Lost |
| C．Losing | D．Because of losing |
“How do you deal with the disagreement between the company and the customers?” “The key ______ the problem is to meet the demand ______ by the customers.”
| A．to solving, making | B．to solving, made |
| C．to solve, making | D．to solve, made |