Although he was in poor health , Robert succeeded ______ other more famous engineers failed.
| A．which | B．that | C．what | D．where |
_______terrible weather we’ve been having these days！
| A．How a | B．What a | C．How | D．What |
---What’s ______population of China?
---China has_____ population of 1.3 billion.
| A．a； the | B．the； a | C．/；/ | D．the； the |
Taking this medicine, if ________, will certainly do damage to your health, as the doctor advises.
| A．continuing | B．continued | C．keeping | D．to keep |
However _______, it’s worth it and I’ll get it .
| A．the watch costs | B．much the watch costs |
| C．the watch will cost | D．much does the watch cost |
—_______ do you like to fly, economy or first class?
—Economy, I think.
| A．What | B．Where | C．Which | D．How |