在下列各句的空格内填上一个适当的完整的单词,该词的首字母已给出.（括号前的字母是这个单词的首字母）
To keep the s() peaceful,everybody is supposed to obey the law.
However,the extra money from the part-time job will strongly s() students in continuing their studies.
We had a s() room,so we invited Mrs Smith to stay with us for a few days.
They waited and w() what to do next.
"Don't forget to take an umbrella with you!"Mum r() me.