A person who has never tasted bitter won’t know ______ sweet is.
| A．which |
| B．what |
| C．when |
| D．why |
—How do you find the cards I’ve collected recently?
—Very nice, especially ________bearing the signature of Liu Xiang．
| A．the one | B．one | C．it | D．ones |
On the flight to Chongqing, the memory of my childhood, _______ I was my father’s shadow, came flooding back．
| A．as | B．when | C．while | D．where |
—Alice, you look puzzled．Haven’t you understood it?
—Yes．I _of another problem just now．
| A．had thought | B．have thought | C．thought | D．was thinking |
—I can’t imagine Phelps was caught smoking on campus!
—_______．
| A．Nor am I | B．So do I | C．Me, too | D．Me, neither |
—What are you doing, John? Why stop?
—To be on the safe side, we’d fill up the car now for we _______ run out of gas on the way．
| A．must | B．will | C．might | D．should |