______ he referred to in his article was unknown to the general reader.
| A．That | B．What | C．Whether | D．Where |
After going into the concert hall, the mother ________ a friend and went over to greet him.
| A．searched | B．knew | C．realized | D．spotted |
He was reading a novel ________ the story reminded him of ________ he had seen during the last war.
| A．when, what | B．that, what | C．whose, that | D．while, which |
The reason ________ she gave for not being present was ________ the heavy snow prevented her coming.
| A．why; because | B．why; whether | C．that; that | D．how; that |
Does the way you thought of ________ the water clean make any sense?
| A．making | B．how to make | C．to make | D．having made |
I failed in the final examination last term and only then ________ the importance of studies.
| A．I realized | B．I had realized | C．did I realize | D．had I realized |