1.句型转换：
A ：The picture is very valuable and you should keep it well.
B:The picture is _____ ______ _____and you should keep it well.
2.He is always full of _____ as through he never know tirdness .
A strength B energy C force D power
这道题选A和B哪个更合适呢?
3.She is always busy doing housework ______I come to vist her family.
A every time B at every time C every time when D at each time
4.He is only too ready to help others,seldom,______,refusing them when they turn to him.
A if never B if ever C if not D if any