periment shows that proper amounts ofexercise, if __ regularly, can improve our health.

依次填入下列各句横线处的成语，最恰当的一组是(　　)①一个企业要摆脱困境，就必须在激烈的市场竞争中大胆改革，锐意进取，勇于创新，克服________的保守思想。②现在还有很多司机不吸取血的教训，仍然酒后驾车，对这种________的行为，公安部门更应该加大惩处的力度。③报载，最近某贪官在法庭上受审时，竟然要求法官放他一马，情愿不做官，回家去种田。这种________真是可笑之至。

He goes to school ___ every day.

Let’s buy some ________ for Grandparents.—Good idea. They like fruit very much.

Our teacher told us to thenew words in the dictionary if we didn’t know them.