用所给词的适当形式填空

小题1:We should prevent fire__________________ (burn) the house at once.

小题2:Please cut out the ___________________ (necessary) words.

小题3:It’s______________ (correct) to drop litter _____________ (care).

小题4:The poor children got back to school_________ (with)the help of the kind people.

小题5:It’s_____________ (excited) for me to pass the driving test.

小题6:I hope this information will help you understand the ________ (important) of study.

小题7:Milk is the ________ (nature) food for young babies.

小题8:Listen! How ___________________ (happy) they are singing and dancing.

小题9:My mother        (cook) when I            (arrive) home yesterday.

小题10:_____ Amy ____ (visit) the Science Museum from 9:00 a.m. to 11:00 a.m. yesterday?

婴幼儿心肺复苏施胸外按压时下述操作方法正确的是（）。

A．按压胸骨中1/3处，使胸骨下陷1cm～2cm

B．按压胸骨下1/3处，使胸骨下陷2cm～3cm

C．按压胸骨下1/3处，使胸骨下陷3cm～4cm

D．按压胸骨上部，使胸骨下陷1cm～2cm

E．按压胸骨上部，使胸骨下陷3cm～4cm