Would it change the context of a sentence if I either omit "about" or exchange it to "what are you thinking of"?

What does "silent auction" mean? Is there any other type of auction?

A silent auction is where people give written bids at the beginning and they are compared with each other. In these types of auction like in all auctions the highest written bid would get the item. There are a few kinds of auctions. Absolute auctions are auctions where there is no set minimum bid and the highest bid will get the item regardless of the final number. Minimum-bid auctions are auctions where there is a set minimum acceptable price and if the highest bid does not go over that then the item is not sold. Reserve auctions are auctions in which the seller can reject the highest bid if they want to. Ex: I went to a silent auction on the weekend. Ex: I think we should use a minimum-bid auction so we are guaranteed to make some money.

Is it okay to not put a verb after "be sure to"? "Transition" looks like not a verb.

While "transition" is often used as a noun, "transition" here is used as a verb. "Transition" here has the same meaning as "move". Because "transition" here refers to the act of "moving" the conversation, it is a verb. Here are some examples of "transition" used as a verb: Ex: I am going to transition to another school next month. Ex: My friend is transitioning to another department at her job.

Why does she suddenly say this sentence? I don't get the context.

In the sentence previous to this, the speaker asks the puppet, "Uncle Grumpy, why are you so angry?" The puppet's "response" to this is "because the President wants to build a wall!" Context clues are important here. This show is set in America, so we can infer that this is a reference poking fun at President Trump's campaign to build a wall along the U.S.-Mexico border.

Would it sound awkward if I say "status" instead of "condition?" If so, what's the main difference between the two words?

"Condition" refers to the state of something in terms of its appearance, quality, or working order. Meanwhile, "status" is different because it means the position of affairs at a particular time. Thus, it would be awkward to use "status" here instead of "condition." Ex: My health has been in poor condition recently. Ex: What's your current marital status?

Is common to use "high in calories" instead of "high calories"? Is there any expression like "high in calories"?

Excellent question. It is common to use both "high in calories" or "high calories" and you will hear them both as frequently as each other. The meaning of the two is exactly the same. You can think of "high in calories" as an expression the same as you would think of "high calories". There is no real difference in meaning. Ex: A high calorie diet is not healthy. = A diet that is high in calories is not healthy. Ex: This cake is high in calories. = This cake has high calories.