单句语法填空
1．It was a ________ (fog) cold morning when he set off for the remote village.
foggy [设空处应填入名词fog的形容词形式foggy。]
2．It is obvious that ________ (nature) disasters have contributed to the continent's economic crisis.
natural [设空处应填入名词nature的形容词形式natural。]
3．The meeting supposed to be ________ (success) turned out to be a failure in the end.
successful [设空处应填入名词success的形容词形式successful。]
4．People certainly have a variety of reasons for going back to school but one important thing to know is, no knowledge is ________ (use)．
useless [设空处应填入名词use的形容词形式useless。]
