Answer:
1. Perhaps the most powerful tool Congress has to check on a president's power is their ability to impeach the president, as it is currently happening. The house of representatives starts the impeachement process, and the Senate either confirms it or denies it.
2. Congress can excercise power over the Supreme Court by means of approving or disapproving future justices. More specifically the senate.
Explanation: The Athenian state was actually a direct democracy while the US is a representative democracy. Citizens are allowed to vote in both states, and both also have a bicameral legislature.
Ataturk supported secularism (the separation of religion and the state organisation) in Turkey and sought to make Turkey more western for example by adopting Roman script.
The correct answer is 4).
The reason why 3) is incorrect is that Turkey was not a communist country before Ataturk's time - it was a monarchy (the Ottoman empire)