66 (3) Elections to the office of Deputy Speaker must be conducted by the chairperson of the Zimbabwe Electoral Commission or his or her nominee, by secret ballot in accordance with Standing Orders, and the results must be announced forthwith. (4) Before commencing his or her duties, the Deputy Speaker must take before the Chief Justice or a judge of the Constitutional Court the oaths of loyalty and office in the forms set out in the Third Schedule. (5) The Deputy Speaker may resign by announcing his or her resignation in person to the National Assembly or, if the National Assembly is not sitting, by giving written notice to the Speaker or, in the absence of the Speaker, to the Clerk of Parliament. (6) The Deputy Speaker must vacate his or her office— (a) upon ceasing to be a member of the National Assembly; (b) upon becoming a Senator or the President of the Senate; (c) upon becoming a Vice-President, Minister, Deputy Minister or Provincial Governor; or (d) if a resolution for his or her removal from office is passed by at least two-thirds of the total membership of the National Assembly. PART 4 TENURE OF MEMBERS OF PARLIAMENT 6.13 Oath of member of Parliament (1) Before a member of Parliament takes his or her seat in Parliament, the member must take the oath of a member of Parliament in the form set out in the Third Schedule. (2) The oath referred to in subsection (1) must be taken before the Clerk of Parliament. 6.14 Tenure of seat of member of Parliament (1) The seat of a member of Parliament becomes vacant (a) on the dissolution of Parliament; (b) upon the member resigning his or her seat by notice in writing to the President of the Senate or to the Speaker, as the case may be; (c) upon the member becoming President or a Vice-President; (d) upon the member becoming President of the Senate or Speaker or a member of the other House; (e) if the member ceases to be qualified for registration as a voter; (f) if, without leave from the Speaker or the President of the Senate, as the case may be, the member is absent from the House of which he or she is a member for twenty-one consecutive days on which the House sits, and the House concerned resolves by a vote of at least one-half of its total membership that the seat should become vacant;