Answer:
Question 8: The legislative branch may remove judges.
Question 9: The Supreme Court may judge executive acts unconstitutional.
Question 10: Congress may override a presidential Veto.
Explanation:
Question 8: The legislative branch may remove federal judges for misconduct, this is very rare, but is one of the main checks the legislative branch has over the judicial branch. The legislative branch does not appoint federal judges, that is a prerogative of the president, Congress can only confirm or veto the president's chosen judges.
Question 9: If any executive action or act is challenged in court, the judicial branch has the power to overturn it if it finds it unconstitutional. The judicial branch does not make the laws, it only interprets them and decides when they are unconstitutional.
Question 10: Congress can impeach the president, although it has happened only twice in history (Andrew Jackson and Nixon). The Supreme Court cannot impeach the president. The most common check used by congress is to override a presidential veto. While the legislative makes laws, it cannot decide on matters of unconstitutionality.