适当形式填空（共5分） 小题1:He promised his father that he _______________(give) up smoking this year. 小题2:I did what I can _____________(help) my brother with his English study. 小题3:The accident suddenly_______________(happen) while the lights were changing to red. 小题4:Everyone agreed that we should stop the factories ______________(pour) the dirty water into the river. 小题5:They think you’d better not ____________(join) this club this year.