With the help of computers, people will find it easier to keep the traffic smoothly.
A：to run
B：run
C：running
D：are running
根据句意及首字母提示完成单词We went to a summer c____ last year.There w____ many trees on the mountains five years ago(以前).We are studying hard for e____ .—He was an English teacher.—R____ ? Did he teach you?What an a____ classroom! It’s too dirty!
