Solution:

Donald had divorced his wife and had remarried. The doctor had operated on his ex-wife.

Solution:

First notice what is written with black ink. You will find the word - Good. Inside those letters, you will see the white space. In the white space, the word "evil" has been written.
If you think of it in a psychological manner, you will be able to understand the hidden meaning. It suggests that "Good" is nothing but the absence of evil.

Solution:

That was a women's football world cup. They had strict rules against female nudity in their country and thus the players were arrested.

Solution:

There are six 'F' in this sentence. Are you astonished? Read the sentence again and this time, count them on your fingers carefully.

Solution:

The stranger said that he thought the room was his. If so, he must have had the keys to the room and thus he must not have knocked.

Solution:

All (all months have twenty eight days atleast)

Solution:

The name of the movie is - Step Up. The graph has to do nothing with it except the fact that the plotting has made steps that are rising.

Solution:

New Year Resolution (Popular Screen Resolution of the year)

Solution:

Bob hacked the server.

You can solve this mystery by assuming every one of them as a hacker turn wise. Suppose Timothy is the hacker. Then, his first and last statement will be lies. But that cant be true as he can speak just one lie.

You will find the same result while assuming Christopher, Maggie and Beatrice as the hackers but will see that while assuming Bob as the hacker, only his first statement is false.

Thus Bob is the hacker.

Solution:

If you know a bit of science, you must be knowing that this expression equals gravity. So the name of the movie is - Gravity.