下列各句中划线字活用情况不同于其它三项的是

Would you like to come to the party?—______, but I’m very busy preparing for the exam.

We all worry about the famous dancer who has recently been diagnosed _____cancer[ ]

I really enjoyed talking with you —but I’m afraidI must be off now!—_____.

What do you suppose made Alice so sad- __________ the computer test.