The old couple have been married for 40 years and never once ___________ with each other．
| A．they had quarreled | B．they have quarreled |
| C．have they quarreled | D．had they quarreled |
To master a foreign language,______.
| A．a lot of practice is needed | B．it needs a lot of practice |
| C．practice is in need of | D．one needs a lot of practice |
They have had a long and bitter struggle _____their living conditions.
| A．to improving | B．for improving | C．to improve | D．improve |
Tom kept quiet about the accident _______lose his job.
| A．not in order to | B．so as not to | C．in order to not | D．not so as to |
The murderer was brought in ,with his hands ______behind his back.
| A．being tied | B．having tied | C．to be tied | D．tied |
He was disappointed to find his suggestion_______.
| A．turning down | B．turned down | C．to be turned down | D．to turn down |