It is importcause problems.

The mayor of Zhuanghe City was ordered to resign because of his refusal to ________ when more than 1000 villagers got down on their knees before the city government office building, begging for his help.

Kunming is a beautiful city ________ flowers and green grass and trees are seen all year round.

I am looking forward to the time ______ I can work as a volunteer for the Youth Olympics .

Did you go to his birthday party last night?— No, I____, but I had some extra work to finish. [ ]