The traffic department has taken effective measures ________ the car speed in the town and ________ the traffic accidents.[ ]
Do you think I should wear a hat to theparty——It all depends on your own__________
Science is really _______ useful sucject although it is very difficult.
Friends are those__________ makeyou smile,alwaysopen their hearts to you and encourage you to succeed
My friend had ________really unusual experience last year.