【C5】A．equalB．worthC．worthwhileD．worthy

A．equalB．differentC．unprecedentedD．fast

【C17】A．equalB．identicalC．equivalentD．comparable

【C9】A．worthB．worth ofC．worthyD．worthwhile

【C7】A．possibleB．practicalC．worthwhileD．useful

【C7】A．safeB．goodC．directD．worthy

【C2】A．worthyB．worthC．worthwhileD．evaluated