1. Fill in the blanks with suitable words.

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The instructions look fine.

All sound fine.

The only thing I'd change is to hyphenate a couple of terms:

pattern-four sentence
and
pattern-three sentence

That's because you're putting those hyphenated words together to serve as an adjective for the word sentence.

=)

As they near the finish line, the runners are usually............ by race officials and by banners that ........ the achievement of crossing the finish line.

How to conjugate empezar and fit it into the sentence La clase ____ a las ocho y media

The directions provided in your question are clear and understandable. However, there are a few improvements that can be made to make them more natural and concise. Here are the revised directions:

1. Fill in the blanks with suitable words.
2. Write the conjugation of the given verbs.
3. Change the sentence from pattern four to pattern three by inserting a suitable preposition in each blank.
4. Fill in the blanks with appropriate words.
5. Write the antonym for each adjective.

These revised directions are more concise, clearer, and follow a more standard format. They also use common terminology.