They use computers to keep the traffic________smoothly.
A:being run
B:run
C:to run
D:running
你还记得龟兔赛跑吗?
请你对参赛的所有动物进行调查,填一填。
如图,在△ABC中,AB=AC,AD⊥BC,垂足为D,E是AC中点,若DE=2,则AB的长为____
John can't go to the party on Thursday because he to go out on school nights.
越来越多的____分解、吸收食物中的营养,同时排出废物,使食物不再是原来的样子,食物就____。