根据所给汉语和句子意思，用英语补全句子。
小题1:Yellow is the color of the sun ,because it can (使我们想起) a sunny day .
小题2:He is hardworking ,he _____________________________(不介意为学生会做额外的工作)
小题3:It is silly of you ____________________________________(不原谅别人的错误)
小题4:Mr Wu spends a lot of time _______________________(解释东西给我们)
小题5:All the students are ________________________(做实验) in the laboratory now .