括号中改错

问题描述:

括号中改错
括号部分中有一个是错的,请帮忙改正.
1.Visits to Disneyland (is) a delight to any child and (usually) a (treat) for (his) parents as well.
2.The American Red Cross is (one) of the volunteer (organizations) (which) purpose is to help (the) sick and the needy.
3.(Jim spent) his (vacation) going to Mexico,(flying to Hawaii),and then (he visited) Canada.
4.The audience (seemed to believe) (that) she (sang so sweet) she (would shame) the birds.

1.Visits to Disneyland (are) a delight to any child and (usually) a (treat) for (his) parents as well.
2.The American Red Cross is (one) of the volunteer (organizations) (whose) purpose is to help (the) sick and the needy.
3.(Jim spent) his (vacation) going to Mexico,(flying to Hawaii),and then (to) Canada.
4.The audience (seemed to believe) (that) she (sang so sweet that) she (would shame) the birds.