Answer:
Walking around the store was like trying to avoid running bulls.
Explanation:
The narrator meets the Medical Man at the Linnaean Society in the city. The Medical Man thinks the Time Machine thing was a trick, but he can't figure out how the Time Traveller did it. The narrator goes back the following week for the Time Traveller's weekly dinner party.
A verb is used to describe an action.
Example: Joan is running to the park to play frisbee.
The key words are: is running.
So, in your question, since Uncle Joe is growing a beard, that'll mean your verb tense is present progressive. It's present progressive because he's growing something, and things that grow have a process to follow through.
I hope I helped :)