In April last year, thousands of holiday-makers in Europe remained ___________ abroad  due    to the volcanic ash cloud.                                                                                  

A．sticking

B．stuck

C．to be stuck

D．to have stuck

小儿风湿热常反复发作，其活动期一般不超过

A．2个月

B．3个月

C．4个月

D．5个月

E．6个月