我们在派对上互相交换了电话号码。

We were ___exchanging phone numbers at the party.

我打算把这条不合身的裙子换成小一码的。

I'm planning on ___exchanging this ill-fitting dress for a smaller size.

我们一边喝咖啡一边交换对这本书的看法。

We were ___exchanging opinions about the book over coffee.

我打算把这件毛衣拿去换一件大一号的。

I'm planning on ___exchanging this sweater for a larger size.