5.28. A. ridden B. flew C. been D. gone

B. 　 arrives

C. 　 will arrive

D. 　 is arriving

A. 　不填;the

B. 　 an;the

C. 　不填;不填

D. 　 the;不填

A. 　 if

B. 　 after

C. 　 that

D. 　 though

A. 　 ridden

B. 　 flew

C. 　 been

D. 　 gone

A. 　因为海洋的热容量总是比陆地大,所以空气总要从海洋流向陆地。

B. 　从总体来看,中国的气候受太平洋、印度洋及北冰洋的影响很大。

C. 　东南西北等地理方位的具体确认,是通过叙述者的位置来确定的。

D. 　在中国,大兴安岭、阴山、及冈底斯山等,是有标志意义的地理名词。

D. 　 is arriving

A. 　 were put

B. 　 being put

C. 　 put

D. 　 have put

A. 　address

B. 　 word

C. 　 area

D. 　 picture

A. 　 either

B. 　 or

C. 　 for

D. 　 and