Looking at our answer choices, there are four types of sentences:

1. Adeclarative sentenceis a sentence that tells the reader about something, and it will always end with a period.
2. Animperative sentenceis a sentence that is a command, it tells someone to do something. This type of sentence will end in either a period or an exclamation point.
3. Aninterrogative sentenceis a sentence that asks something, it's a question. This type of sentence will always end with a question mark.
4. Anexclamatory sentenceis a sentence that shows excitement, surprise, or a strong emotion. This type of sentence will always end with an exclamation point.

Let's look at the sentence from the question:

I got an A+ on my science project!

This sentence ends in an exclamation point and it is showing excitement; thus, this sentence is an exclamatory sentence.

Looking at our answer choices, there are four types of sentences:

1. Adeclarative sentenceis a sentence that tells the reader about something, and it will always end with a period.
2. Animperative sentenceis a sentence that is a command, it tells someone to do something. This type of sentence will end in either a period or an exclamation point.
3. Aninterrogative sentenceis a sentence that asks something, it's a question. This type of sentence will always end with a question mark.
4. Anexclamatory sentenceis a sentence that shows excitement, surprise, or a strong emotion. This type of sentence will always end with an exclamation point.

Let's look at the sentence from the question:

Take the garbage outside.

This sentence ends in a period, so we can eliminate "exclamatory" and "interrogative". This sentence is telling someone to do something, take out the garbage; thus, the correct answer is imperative.

Looking at our answer choices, there are four types of sentences:

1. Adeclarative sentenceis a sentence that tells the reader about something, and it will always end with a period.
2. Animperative sentenceis a sentence that is a command, it tells someone to do something. This type of sentence will end in either a period or an exclamation point.
3. Aninterrogative sentenceis a sentence that asks something, it's a question. This type of sentence will always end with a question mark.
4. Anexclamatory sentenceis a sentence that shows excitement, surprise, or a strong emotion. This type of sentence will always end with an exclamation point.

Let's look at the sentence from the question:

Will you go get the mail from the mailbox?

This sentence ends in a question mark; thus, this sentence is an interrogative sentence.