II.单项填空(共15小题;每小题1分，满分15分)
21.The news came to us as _______ great surprise that he had turned __________ writer.
A a; a B a; / C. /; a D. /; /
So difficult _____it to live in an English-speaking country that I determined to learn English well.
| A．I have felt | B．have I felt | C．I did feel | D．did I feel |
So ____ that no fish can live in it.
| A．the lake is shallow | B．shallow the lake is |
| C．shallow is the lake | D．is the lake shallow |
---David has made great progress recently.
---_____, and ______.
| A．So he has; so you have | B．So he has; so have you |
| C．So has he; so have you | D．So has he; so you have |
Only in this way _____ progress in your English.
| A．you make | B．can you make |
| C．you be able to make | D．will you able to make |
Only when the war was over _____ to his hometown.
| A．did the young soldier return | B．the young soldier returned |
| C．returned the young soldier | D．the young soldier did return |