The function of the Protem Speaker is to fulfill the role of the Speaker in certain situations. Option 1 states that the Protem Speaker conducts the proceedings of the House in the absence of the Speaker. This is a correct function of the Protem Speaker. Option 2 says that the Protem Speaker officiates as Speaker when a Speaker is unlikely to be elected. This is not accurate as the Protem Speaker only acts as a temporary Speaker until a regular Speaker is elected. Option 3 correctly states that the Protem Speaker is responsible for swearing in members and holding charge until a regular Speaker is elected. Option 4 suggests that the Protem Speaker checks if the election certificates of members are in order. This is not a function of the Protem Speaker. Therefore, the correct answer is provided in the question.