根据汉语意思完成句子，每空一词。
1.据说这个著名的歌星下周将来我们这个城市。
________ ________ ________ the famous singer will come to our city next week.
2.自从她来到这里，许多变化已经发生了。
Since she came here，many changes have ________ ________.
3.这个气球掉入水里，留在了那里。
The balloon ________ ________ the water and remained there.
4.我的朋友爬山时，意外地摔了胳膊。
My friend broke his arm ________ ________ when he was climbing the mountain.
5.毫无疑问这次会议是相当成功的。
________ ________ this meeting is quite successful.
1.It is said 2.taken place 3.fell into
4.by accident 5．Without doubt
___________