1.咱们不喝咖啡改喝茶吧。 Let’s drink tea _______ _______ coffee. 2.字母x代表未知数。 The letter “x” _______ _______ an unknown number. 3.那时街上一个人也没有。 _______ _______ was in the street at that moment. 4.本周我们还有两节数学课。 We will have _______ _______ maths classes this week. 5.学习的目的不是为了参加考试。 The point of studying is not to _______ _______.