100% thesis is a must for this paper!!!
Last year I had a similar topic and guess what !!! my mark was not good at all because the teacher said, “no thesis statement”.
Learn from my mistake!

The participle in the sentence is used in metaphoric meaning. It presupposes that both smell and I enter the house. What about this version “When I entered the house, the smell of chocolate cookies and fresh flowers in the vase hit me like a sudden crashing into the stranger in the street”.

Can I give you a piece of advice? Do not write introduction and conclusion first. Your introduction should contain some preliminary information about the following content. Write the body of your essay first, and then you can see what can be included in the introductory paragraph. Even if you have an essay at your exam, start writing the most important information. When you are done, move to the introduction.
Nobody can say it is not right! One more thing, write short outlines — enumerate major points of your essay, and what can you say about them. Be sure to make the process easier. You will know what to include in your text. Feel free to do the same at your exams. What concerns introduction, I cannot write it for you because I do not know what do you want to include in it.

Hi, first you should understand what is an expository essay. In this kind of essay, you should provide your readers with maximum information about the particular topic. The central task of the writer is to make all details clear and concise so the readers can easily understand the topic being discussed. The important thing about the expository essays is that they should be impartial.
You should not explain your point of view. You have just to describe the particular phenomenon without creating an argument. So, two basic rules include being impartial and know your target audience.

It is necessary to understand that an invention may be described as an improvement of something has already existed in the past. Also, it may be something that is different and not expected. Also, it is imperative to mention that inventions help with employment in most situations.
They have become a core part of modern society at this point, and expectations of consumers are set incredibly high. New technologies are always being introduced, and some of them may be disruptive.
Overall, the need for constant improvements should not be overlooked, and it frequently leads to interesting inventions.

Well, your thesis starts with a major overstatement that is not true. Your thesis should be setting out the topic of the paper which you are going to talk about.
It should not be very simple or obvious because you have to spend the rest of the paper for supporting it.