题目内容：

用括号中所给词的适当形式填空，使语篇意思完整，必要时请用否定式。

On April Fool's Day，strange things may happen.Our friends will play jokes on 1.(we) and try to fool us.

People don't know the origin(起源) of April Fool's Day 2.(clear)．Some say April Fool's Day began many years ago in 3.(French)．Long ago in France，the old New Year's festival was celebrated from March 25th to April 1st and ended with 4.(change) of presents.Later the King changed the New Year to January 1st.Some people still celebrated the New Year in April.They were called April Fish and 5.(give) presents as a joke.

But in many countries，April Fool's Day 6.(celebrate) on April 1st but on other days.In Mexico，April Fool's Day is on the 28th of December.In ancient Rome，the day 7.(be) on the 25th of March.In India，the day is on the 31st of March.In America，the day is 8.(most) decided by young people who want to make fun of other people.But it is important  9.(remember) that your friends and you will be both happy.One must remember the  10.(different) between a good joke and a bad one.