下列各题中均有一个错误,找出并改正

下列各题中均有一个错误,找出并改正
1.you won't (be) successful unless you (will) work (hard)
2.he (is) (enough old) (to go) to school.
3.they are (trying their best) (helping) (save) the poor child.
4.he is the (second) (taller) (of) all the boys in our class.
5.he (is) (very) more outgoing (than) you.
6.(did) she decide (go) camping (with) us?
7.can you (tell) me how (can) i (make) the fruit salad?
8.she (doesn't) （go to bed）（until） 11：00 last night.
9.(if) he （won't） come here,the party （will be） meaningless.
10.this boy sings a (little) more (beautiful）（than）that boy.