—Why does the lake smell terrible?
—Because large quantities of water __________.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
This is the second time that I_______ London. The first time I_______ here was on Christmas Day last year.
| A．visited; came |
| B．have visited; have come |
| C．visited; had come |
| D．have visited; came |
--- How do you find Mr Li’s lecture?
--- Good indeed. It_______ many problems we have come across in our study.
| A．says | B．talks |
| C．covers | D．refers |
_____it is to jump into a river to swim on such a hot day.
| A．What a fun | B．What fun |
| C．How funny | D．How a fun |
________ the final exam________ up soon, we should get down to our studies.
| A．With; comes | B．Because; come |
| C．With; coming | D．Because of; will come |
In recent years, with the help of our teacher, I have made_____ rapid progress in ____math.
| A．a; the | B．a; 不填 |
| C．不填; the | D．不填; 不填 |