John couldn’t take part in the activity held at the cultural center yesterday for _____ reasons.

 The little boy, out of curiosity, _______ the toy to see how it worked, but couldn’t put it together.

(2013 ·安徽名校联考Ⅰ)—May I speak to Mr.Smith?—I am afraid not.He is at a meeting now.It's not ________.

 Jumping out of ___ airplane at a height of 5000 kilometers is ___ unforgettable experience.           

 It saves time in the kitchen to have things you use a lot ______ easy reach.