21. If we expect ________ much cleaner world, we should attract ________world’s attention to protect the world.

A. a; a                      B. a; /                C. a; the                    D. the; /

22. What he said didn’t mean to hurt Mary, but he felt ________ it differently.

A. he could express                                            B. he could have expressed  

C. he would express                           D. he must have expressed

23. The village I grew up _________ was destroyed by the earthquake last year and is under construction now.

A. in                        B. in it               C. in that             D. in which