Many difficulties have ______ as a result of the overuse of coal

Mum, I’m tired of eating porridge every morning. Could I have ________ —How about trying some sandwiches tomorrow, dear

______ is Li Ping—He is in the classroom.

English has large vocabulary, hasn’t it?–Yes, _____ more words and expressions and you will find it easier to read and communicate

Mum, my teacher, Mr. Wang. — Nice to meet you, Mr. Wang.