Teachers have to constantly update their knowledge in order to maintain their professional ________．

 I do hope that you can give me some good _______ on how to improve my spoken English.     

At the meeting they discussed three different ______ to the study of maths.

Tom succeeded, for he had made a great ______ and got over plenty of difficulties.

In my opinion, what he told us just now about the affair simply doesn’t make any ________.