We must have the machine ____.
Liu Tao is always ______to bring his homework .----You see ,he has ____it at home again .
The number of the students in our school _____increasing now and a number of them _____abroad
---______plastic bags we use, _____it will be to the environment.----I agree ____you .
---The English exam wasn’t difficult at all ,was it ?---No ,but I don’t believe _____could pass it .
---Are these apples enough for you all ?---I’m afraid not ._____are needed .