一物体做匀加速直线运动，初速度为0.5m/s，第7s内的位移比第6s内的位移多4m，求：
①NaH+H2O═NaOH+H2↑
②2Na2O2+2H2O═4NaOH+O2↑
③Na+2H2O═2NaOH+H2↑
④3NO2+H2O═2HNO3+NO
⑤2H2O 通电__ 2H2↑+O2↑
⑥2F2+2H2O═4HF+O2
水只作氧化剂的是____；水只作还原剂的是____；水既作氧化剂，又作还原剂的是____；水既不作氧化剂，又不是还原剂的是____
①CH3（CH2）3CH3
②CH3（CH2）4CH3
③C（CH3）4
④（CH3）2CHCH2CH3．
Tom is very young. But ________ working ability, he's much more experienced than others.
____ ____, I want to____ ____ ____you.
