keen

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Keen as mustard, as the sub-title suggests, also prefers to blame the trials on Britain and, to a lesser extent, the United States, and tries to portray the Australians as hapless victims of foreign experimenters.
The kid is as keen as mustard, he can take a shot and give one.
Lee Woodyatt and Ryan Sugden are as keen as mustard to get into the action, so that gives me options,'' said Wright.