In my opinion, Jack, though relatively stubborn, was not too difficult ___.

Can you tell the differences between these two pictures?—Differences? Oh, no. They look quite____________.

I’m sorry I can’t stop with you. I have much work to do.

I met a friend of mine _____ I was walking in the park.

Why is the classroom so dirty?——Sorry, Sir. It _____ yesterday. We forgot to do it.