Here are the best options for each blank:

1. **c. main** - "Breakfast is the main important meal of the day."
2. **a. healthy** - "...the nutrients your body needs for good health."
3. **c. energy** - "...calories it needs for energy and helps to maintain your blood sugar level."
4. **b. enable** - "...and are often slow, tired, hungry, and enable you to concentrate."
5. **d. drop** - "It’s easier to drop weight if you eat..."
6. **a. in** - "...the day does."
7. **d. most** - "...than having two larger meals a day does."

So the complete text would read as follows:

"Breakfast is the **main** important meal of the day. It provides the nutrients your body needs for good health, the calories it needs for **energy** and helps to maintain your blood sugar level. Studies have shown that people who don’t have breakfast have a low blood sugar level and are often slow, tired, hungry and **enable** you to concentrate. Surprisingly, breakfast actually plays a part in weight control. It’s easier to **drop** weight if you eat in the morning rather than later in the day. Dividing the day’s calories **most** weight if you eat breakfast and having two larger meals a day does."