I met a friend of mine _______ in the street yesterday.
A:by accident
B:by the way
C:by mistake
D:by car
Our geography teacher told us the sun _______ in the east and sets in the west.
清华大学的校训是“自强不息,厚德载物” 。要做到自强()①首先要自立 ②必须要战胜自我,超越自我③要有坚强的意志,经得起生活的磨砺 ④有正确的人生目标并矢志不渝地追求