―_______do they go to school every day ―On foot ,of course .

Have you heard that Tom, as well as his parents, ________ moved to Beijing ? —Really ? No _________ I haven’t seen him for a long time.

One of the main characters in this cartoon______ very popular among us.

The question that puzzled us is _____ wecan get rid of the air pollution in the area.

The number of English learners ________ increased.