The boy said that he had _________ the pen on the desk, but I thought he ________ to me.

Internet shopping will really _____ when people believe that it is safe.

We can hardly ________ what he really means on this controversial problem, as he doesn’t show his clear stand to anyone of us.

I can't __ the difference between them because they look like the same.

To learn how their children are doing at school, parents  need to _______ the teachers every now and then.