很简单的,我英语通过六级了,我来回答:
1.why not going boating on the river?
(因为语法规定why not doing sth.)
2.let mary make a shopping list.Then she will not forget anything
(let sb.do sth.)
3.Some children are flying model plans in the park.The others are fishing.
4.He hasn`t a televsion.He wants to have it.
5.Mrs.Smith often asks them questions.They can answer the questions quickly