根据句意或中英文提示写出句中所缺单词。(共5分) 1.Sandy doesn’t go to school today b__________ she is ill. 2.We will have supper at my __________ (爷爷奶奶) home. 3.Those old men and women do morning __________(锻炼)every day. 4.Our first lesson usually __________(begin)at 7:25am every day. 5. __________ comes before Thursday.