完成句子。 1. 我认为上课不能迟到。I ________ think we can ________ ________ ________ class. 2. 你饭后经常帮妈妈洗餐具吗？Do you often ________ mum ________ dishes after meal? 3. 我们得吃些食物，我们太饿了。We ________ ________ eat some food.  We are too hungry. 4. 这件事使老师感到不高兴了。That ________ the teacher ________ ________ . 5. 因为她总是有太多的家务活要做，所以她从不开心。She never ________ ________ ________ because she has ________ ________ housework to do.