根据汉语意思完成句子，每空一词。(共5小题；每小题2分，共10分）在街上边走边吃是不礼貌的。
It’s impolite to eat or drink while _________ ________ the street.这种新玩具主要针对国外市场。
The new type of toys is mainly ________ ________ the foreign markets.多亏了刘老师，我的数学考试及格了。
__________ ________ Mr. Liu, I could pass the math exam.请讲话大声点，以便我们能听清楚。
Please speak loudly_______ ________ we can hear clearly.在圣诞节，父亲们通常装扮成小丑。
On Christmas Day, fathers usually _________ _________ as clowns.