The governments should the use of new types of energy to make a greener world.

What do you think of Tom —He has been working very hard. ______ heis an advanced worker.

jority of rural migrants are engaged in the most painstaking, most tiring and dangerous work, _______ college graduates are reluctant to do.

______ the teacher has given permission, ______allowed to use the equipment in the lab.

Chinese is becoming more and more popular.It ________ in many schools in foreign countries.