They were thirsty, so they went ______ something to drink. [ ]

heard that your daughter had been admitted by a famous university.—But they charge so high tuition.I can’t _________such a large sum.

You should try to get a good night’s sleep ______ much work you have to do.[ ]

We went around town putting _____ posters for the charity show.

填入下面一段文字横线处填入语句，最恰当的一句是（ ）种群中较弱个体的存在，可能有助于加强种群的长期稳定性，从而减少灭绝的险。 ，结果发现，鱼群中混有多种不同的性状，会对种群产生积极的影响。那些在近海珊瑚礁区发育的幼鱼更可能返回成年时的栖息地；那些在潮池区发育的幼鱼可能成为繁殖的“赢家”，但它们通过增加数量和减少波动，为种群的稳定性做出了贡献。