He________a wild duck，but he didn't________it.
| A．shoot at；shoot | B．shot at；shoot |
| C．shot；shot at | D．shoot at；shot |
We already have ______ pencils, but we need two ______ pens.
| A．dozen of, dozen | B．dozens of, dozens |
| C．dozens of, dozen | D．dozens of, dozen of |
Jim is ______ person, and everyone is willing to be ______ with him.
| A．so kind a, friends | B．so a kind, friends |
| C．so kind a, friend | D．so a kind, friend |
By all _______, you must try every _______ to help him.
| A．mean, mean | B．means, means |
| C．means, mean | D．mean, means |
In fact, _______ one cause that leads to the problem.
| A．cattle is | B．cattle are |
| C．cattles are | D．the cattles are |
She is not a competent driver and can’t cope with driving in _______.
| A．heavy traffic | B．heavy traffics |
| C．crowded traffic | D．crowded traffics |