根据首字母提示或汉语意思填写单词,完成句子

根据首字母提示或汉语意思填写单词,完成句子
1.With the d________ of science and technologh,more and more difficult problems can be solved easily.
2.Never d_______ our English study.It's bridge to the world.
3.The more careful you are in the exam,the fewer m_______ you will make.
4.A friend o________ me cigarettes at a party,but I refused.
5.Look,the s_______ in the library are really dirty.why don't you do some cleaning?