What should we say if in such a situation?

[luluai]

Following is a sample question from TSE.What should we say if in such a situation?[8)]

Now you will be asked to respond to a co-worker. Imagine that you happen to meet a colleague who has recently received a promotion. Greet your colleague and be sure to
mention the recent promotion,
express your positive reaction to the promotion, and
extend appropriate wishes to the colleague.