So difficult ___________ it to live in an English-speaking country that I determined to learn English well.
| A．I have felt | B．I felt |
| C．I did feel | D．did I feel |
At the back of the book _______ of the works available for further research.
| A．listed are the titles | B．are the titles listed |
| C．are listed the titles | D．the titles are listed |
Without the air to hold some of the sun’s heat, the earth at night _____ too cold for us to live.
| A．would be freezing cold | B．will be freezing coldly |
| C．would be frozen cold | D．can freeze coldly |
It sounds like a good idea, but it _________ to be seen whether it will succeed.
| A．leaves | B．remains | C．stays | D．reminds |
---Did you go to the show last night?
--- Yeah． Every boy and every girl in the area ____ invited．
| A．were | B．was | C．has been | D．have been |
you may have , you should gather your courage to face the challenge .
| A．However serious a problem |
| B．Whatever serious a problem |
| C．However a serious problem |
| D．No matter how a serious |