They _______ put the plants inside yesterday.
A:don't
B:didn't
C:doesn't
9.36×9÷1.8=____
①富有挑战性的课程 ②新奇的实验器材
③丰富多彩的社团 ④新校园、新老师、新同学
When __________ to danger and conflict, men tend to increase blood pressure, __________ nervous or anxious .