动词填空（写出所给的动词的适当形式）（共5小题；每小题1分，满分5分）

小题1:Seventy-two hours passed . More than one hundred workers remained _____________(trap) in the coal mine, though fifty had been saved.

小题2:_____________________(determine) to get a seat for the concert, he didn’t mind standing in a queue all night.

小题3:The bad weather is reported _____________________(contribute) to the passenger plane crash in Iran on January 9.

小题4:__________________ (experience) many failures, I have the courage to meet all challenges.

小题5: _________________ (examine) twice a year, whether it is a car or a bus or a truck, is the rule that every driver shall obey in this city.

为证明鸡蛋壳的主要成分是碳酸钙，应该在鸡蛋壳上滴加（　　）

A．酱油

B．水

C．食盐水

D．白醋