—Did you find the missing couple in the mountain yesterday?
—No, but we ______ to get in touch with them ever since.
| A．had tried | B．have tried | C．have been trying | D．had been trying |
.He is not such a man _______ would leave his work half done.
| A．that | B．which | C．who | D．as |
My neigh bours used to give me a hand in time of trouble, _______ was very kind of them.
| A．who | B．which | C．that | D．it |
I want to use the same tools _______used in your factory a few days ago.
| A．as was | B．which was | C．as were | D．which |
I have two grammars, ______are of great use.
| A．all of which | B．either of which | C．both of that | D．both of which |
That is not the way ______I do it.
| A．/ | B．which | C．for which | D．with which |