Here are the corrections for each sentence based on standard English grammar:

1. **Pizzas (A)** are **healthier (B)** and **more delicious (C)** than potato chips (D).
- *Correction:* "more" should be used before "delicious" for parallel structure, as "healthier" is in comparative form.

2. There **isn't (A)** any milk and **(B)** cheese in the fridge **(C)** so I **can’t (D)** make the cake.
- *Correction:* "aren't" should be "isn't" because "there is" is used with uncountable nouns or singular subjects.

3. Although **(A)** his **advanced (B)** age, Mark performed **excellently (C)** in his latest **(D)** film.
- *Correction:* "old" should be "advanced" or some other more appropriate term to give a proper meaning when discussing age in a positive context.

4. Almost people (A) were **shocked (B)** by the way (C) the film star behaved (D).
- *Correction:* "Almost people" should be "Most people" or "Almost all people" to sound more natural, and "shock" should be "shocked" for correct verb form.

Here is a revised version of each sentence:

1. Pizzas are **healthier** and **more delicious** than potato chips.
2. There **isn't** any milk and cheese in the fridge, so I **can’t** make the cake.
3. Although **his advanced** age, Mark performed **excellently** in his latest film.
4. **Most people** were **shocked** by the way the film star behaved.