Solution:

The timer of a microwave.

The timer of a microwave generally consists of 4 digits. First two digit for minutes and next two for seconds.
So,
99 indicates - 1 minute 39 seconds
100 indicates - 1 minutes (1:00)

Solution:

The fastest or even the slowest rabbit can only run till the mid point into the given garden. After the mid point, it will actually be running out of the given garden.

Solution:

It is an easy task. You just have to give the last chocolate along with the basket. That way, all gets a chocolate and the last one remains in the basket as well.

Solution:

It can be done as shown in the picture below.

Solution:

John Walters was drowned in the quicksand.

Solution:

It can surely be true because it is not mentioned that it was raining.

Solution:

You should reject the bet. When you give him $100, he won't be able to convert it into $500 dollar and will lose the bet. Thus, he'll give you $50. But your $100 will be with him and therefore, you are going to lose your money anyhow

Solution:

Alexandra used two planks as shown in the picture below.

Solution:

Yellow switch

The trick to solve this problem is to start from the bulb.

Solution:

You are the ship captain. Read the first sentence again. Therefore, the color is same as your eyes color.