单项选择题
Intertropical convergence zone over south Phillippine passing over Mindanao northern Sulu and Palawan. This paragraph is likely to be under the heading of（）.
A.gale warning B.24 hours forecast C.synopsis D.storm warning
单项选择题 It takes about 12 seconds to reverse（）full speed ahead（）speed astern.
单项选择题 It was essential that the application forms（）back before the deadline.
单项选择题 Jim is sorry（）so impolite to your guest last Saturday.
