用所给词的适当形式填空
【小题1】He is an American man who ____(be) interested in mountain climbing.
【小题2】This is one of the most exciting ____(thing) about doing dangerous sports.
【小题3】Aron did not give up ____ (climb) after the accident and keeps on ____ (climb) mountains today.
【小题4】He would have to do something ____(save) his own life.
【小题5】After ____ (lose) his arm, he wrote a book called Between a Rock and a Hard
【小题6】A man has two _______ (foot ); a dog has four _______ (foot).
【小题7】He had to lie down for a while ________ (rest) his legs.
【小题8】This bus can carry 40 ________ ( passenger).
【小题9】I have a ___________ ( tooth ) because there is a cavity（洞）in one of my ______ (tooth).
【小题10】Mary hurt _________ ( her ) when she fell over .