Why are you so _______,Amy?—I thought I lost my purse, but I didn’t. I found it in my study!

Dr. Ma used to __________in a hospital.

This problem is too difficult. — You can’t work out the math problem unless you ______ to your teacher carefully. [ ]

Nobody can finish the work ______ me.[ ]

It’s difficult for such a girl to swim ________ the river. [ ]