Could you help me ______ the child more these days?He seem s

Could you help me ______ the child more these days?He seem strange resently
A see B observe C notice D took
为何不选C呢 C也通吧
___________is hard is to do good all one's life and never do anything bad
A he B it C that D what
When and where the nev stadium till be built _____decided yet
A are not B hasn't been C haven't been D has not