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.