根据括号中所给的汉语写出单词，使句子意思完整正确。
【小题1】-- My sister keeps five____________( 日记) every week.
--Sir, there's too much noise here.
【小题2】___________ (生物) is a little difficult for me,but I like it very much.
【小题3】There is a __________(现代化的) shopping centre in my hometown.
【小题4】Don't make him do this or that. He's_____________ (仅仅) a child of 7.