It was playing computer games _____ cost the boy plenty of time _______ he ought to have spent doing his lessons.

_______, we continued our way.

ent Xi Jinping urged that officials and public figures _________by example and _______ good values among Chinese citizens, especially the younger generation.

I often go ______ school by bus, but I walk ______ my home after school.

下面与e 字母不含有相同因素的是 。