I get the two of them mixed up,they are so similar.[ ]

The knee is the joint ______ the thigh bone meets the large bone of the lower leg [ ]

She said the contest ________ by the Students’ Union the next Friday

He’s only too ready to help others, seldom, _____ refusing them when they turn to him.

Joan was badly injured in the accident yesterday and she was sent to hospital.— Oh, really I ________. I ______ visit her.