1. Don't it _____ any more .

2. I can't_____ his address.

3. We'll ____your suggestion (建议) and give you our answer tomorrow.

[ 一语击破 ]

think about 和 think of 表示“考虑”、“对……有某种看法”时，可以互换。

如：

They are thinking about / of buying a new computer .

注意：当 think of 表示以下意义的时候，一般不可和 think about 互换：

( 1 )想要;打算。如：

Mary ， are you thinking of marrying Jack ?

( 2 )想出;想到。如：

I can't think of his name at the moment .

( 3 )关心，想着。如：

Lei Feng was always thinking of others but never thinking of himself .

think about 表示“回想过去的事件”、“考虑某计划是否切实可行”时，一般不和 think of 换用。如：

I often thought about what the teacher said last time I saw her .

think over 意为“仔细考虑”。