动词填空 （本大题共8分，每小题1分）
You had better ____________ ( not laugh ) at others because everybody makes mistakes.
All the rules must ___________ (explain) to the players clearly before the game starts.
---- It seems that you know a lot about the story.
---- Well. We _____________ (read) it many times.
It is said that he devoted much of his time to _____________ (write) his new novel.
Boys and girls, please read the guidebook carefully, or you ___________ (get) lost during the visit.
Fifty students have entered the writing competition since it ___________ (hold) for the first time.
He promised us that she ____________ (tell) him about the event at the proper time, but actually(事实上) she didn’t.
Before our teacher reminded us, we ______________ (send) the e-mails.