1.we should prevent people ______drop litter here and there
2.they had to wait there for a long time because of the ___weather He was ____ill after working too much 3.when I asked him to go with me,he____(shake)his head to tell me that he couldn't 4.The airport was ____(close)because of the rainstorm 5.Luckily,the litter boy kept ____(live)in the accident 6.the letter i look forward to ____(come)3 days later at least 7.the robbers rain in all _____(direct)when they heard the big noise 8.the___of his job worried his father