—Can I help you?—Thanks. But I think the box is ______ heavy for you ______ carry.
I think it is ______ useful advice, so I will always remember it.
We should think more of others if we want to ______ them.
—I feel really tired. —______.
—Can you tell the differences between these two pictures? —Differences? Oh, no. They look quite ______.
—What were you doing when we were playing basketball yesterday afternoon? —I ______ the classroom.