2道英语单选1.--------- energy under the earth must be given off i

2道英语单选1._________ energy under the earth must be given off in one form o……
1._________ energy under the earth must be given off in one form or another,for example,an earthquake.
A.Gathered B.Collected C.Accumulated D.Adjusted
为什么选C而不是A?
2.I think all these are main points ______ much attention.
A.which worth B.worthy of
为什么A不可以选