A computer is so useful a machine ________ we can use everywhere.
| A．that | B．which | C．as | D．what |
He suffers two heart attacks in a year. It hasn’t stopped him drinking wine, ______.
| A．though | B．either | C．too | D．neither |
______ the worker’s working efficiency, the manager will allow him to have a coffee break.
| A．Improving | B．To improve | C．Having improved | D．Improved |
John’s success has nothing to do with good luck. It’s years of hard work ______has made him what he is today.
| A．why | B．when | C．which | D．that |
The country life he was used to ______ greatly since 1998.
| A．change | B．has changed | C．changing | D．had changed |
Though these dresses are low in quality, they may ______ women who don’t want to spend much on clothes.
| A．refer to | B．devote to | C．apply to | D．appeal to |