---Who’s the man talking to our teacher?
---A professor_____a visit to our school.
| A．pays | B．to pay | C．paid | D．paying |
Much to our relief, although we are not that rich, our income is now double______it was five years ago.
| A．that | B．than | C．which | D．what. |
I didn’t understand ________led him to be late for three times every week.
| A．what it was that | B．it was where that |
| C．how it was that | D．why was it |
_______ made me angry was that it never______ her that her parents might be worried.
| A．That; happened to | B．What; occurred to |
| C．What; belonged to | D．That; meant to |
We should remember to save water resource and not to leave the water_____all the time.
| A．to be running | B．to run | C．running | D．run |
Although her ability in art has not yet developed, she has great____ as an artist.
| A．success | B．potential | C．victory | D．possibility |