根据汉语意思完成下列句子。 1.你怎么不加入一个英语俱乐部来练习讲英语呢? Why ____ ___ an English club ___ practice ___ English? 2.生活中每个人犯错误. Everyone will ____ ___ in life. 3.我爷爷习惯星期天去钓鱼. My grandfather is ____to____ ____ on Sundays. 4.在那个年纪他们还不够严肃. They are not ____ ____ at that age. 5.作为学生,我们应该遵守校规. As students, we should ____ ___ ____ in our school.