Using eight eights and addition only, can you make 1000?

What has one letter and starts with an E?

In the four images below, can you find the odd one out?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?