用括号中所给词的正确形式完成句子

1。Which animal is _the most important___(important) to protect of all。2。A camel can walk a long way without _drinking___-(drink)。3。We are tired。Let's stop__to have__(have)a rest。4。I'm __interested__(interest) in all kinds of animals。5。We are surprised _to hear___(hear) that our team lost the game。6。She's lucky。She has nothing __to worry__(worry) about。7。The dirty water isn't good __to drink__(drink)。8。It's more difficult for older people _to learn___(learn) English。9。Many animals are in danger,but it's hard to stop the _killers___(kill)。10。Gymnastics is sometimes __dangerous__(danger)。You must be careful。