The bedroom is in a terrible mess; it______cleaned.
A．can't have been
B．shouldn't have been
C．mustn't have been
D．wouldn't have been

未分类题What is the main idea of the passage?A．Great amount of food is wasted at public places.B．Individuals don't pay attention to food waste.C．It costs more money to make environmental friendly disposal,D．Lots of new methods are taken to dispose food waste.

未分类题What is the main reason for people paying attention to food waste?A．To lower the cost of food waste.B．To save more food for the world.C．To keep the dining room clean.D．To reduce the effort of cooking.

未分类题What kind of measure has been taken to cut food waste?A．Making cafeteria at collage and universities trayless.B．Using software system to trace the location of the trash.C．Trying to remove the food waste little by little.D．Charging higher prices for smaller amount of food.

未分类题Whats the benefit of installing food-only trash cans at the airport?A．It will reduce the cost of removing the trash.B．It will keep the airport clean and tidy.C．It will faster the process of making trash into compost.D．It will remind the passenger to produce less trash.

未分类题Exposure to asbestos fibers can cause cancer_____A．only when asbestos is used in building industryB．only when it is used in large quantitiesC．even if it is used in small quantitiesD．if they are used when wet rather than dry