If you are weak ____ a subject, ______your teacher for advice can help.

Last Sunday was my birthday. My mother bought _______ iPhone4 as _______ birthday present for me.

Peter is a polite student. He is kind _____ everyone. [ ]

I had hardly got to the office ______ my wife phoned me to go back home at once.

Has Sam finished his report?—I have no idea. He _______ it in his office the whole morning.