语法填空（共10小题，每小题1.5分，满分15分）
阅读下面短文，根据上下文填入适当的词语，或使用括号中的词语的适当形式填空。
Chinese President Hu said before arriving in Pittsburgh ahead of the G20 summit, “To realize __1__ safer world for all, we must first and foremost remove the threat of nuclear war,” saying Beijing has always wanted complete __2___ (prohibit) and thorough destruction of nuclear weapons. Hu also said, “All countries should join the NPT (Nuclear Nonproliferation Treaty) and make real efforts to uphold and enhance its authority and __3__ (effective).” It was the third day when Hu had made a major speech before world leaders. __4__ was the first time that he __5__ (address) such a high-level summit on disarmament(解除武装) and nonproliferation(消除核扩散). Hu made five proposals in his speech, _6__ (say) all countries with nuclear weapons should publicly commit to not wanting to possess _7__ in the long term. Hu said China will consistently support nonproliferation and disarmament treaties. “We have adhered to(坚持) the policy of no-first-use of nuclear weapons at any time and __8__ any circumstance, and made the commitment that we will unconditionally not use or threaten to use nuclear weapons _9__ non-nuclear-weapon states or nuclear-weapon-free zones,” said Hu. The Chinese president said the function of the International Atomic Energy Agency should __10__ (strength).