阅读以下句子，仔细观察加颜色部分并补全空格。 1.By now his restaurant ought to be full of people. 2.Does your father need any help? 3.What do we need to take for the picnic? 4.You needn’t try to explain. 5.His mother is ill.He has to stay at home to look after her. 6.Something terrible must have happened if Li Chang was not coming to eat in his restaurant as he always did.