As we have mentioned previously, we will be dedicated to solving the problem within the current framework, rather than _____ a new one.
| A．establishing | B．establish |
| C．to establish | D．established |
Many of them turned a deaf ear to her advice, _______ they knew it to be valuable.
| A．even though | B．now that | C．as if | D．as long as |
After his retirement, John fishing as one of his new hobbies.
| A．took over | B．took in | C．took for | D．took up |
In this workshop, the output of July was three times __________ of January.
| A．that | B．this | C．one | D．it |
Leonardo da Vince_____birds kept in cages in order to have the pleasure of setting them free.
| A．is said to be buying | B．is said to have bought |
| C．had said to buy | D．who said to have bought |
— What made Bill so angry?
— ______. His girl friend promised to come at 8:30, but she hasn’t come yet.
| A．Having kept waiting | B．Being kept waiting |
| C．To be keeping wait | D．Being kept waited |