单项选择题
Plants use the carbon, along with sunlight, for growth, and （） oxygen into the atmosphere in a process known as photosynthesis.
A.relieve B.relate C.release D.retain
单项选择题 If things are going badly, the optimist acts quickly, looking for （） and forming a new plan of action.
单项选择题 Some people wait for （） to come knocking. Some people sought it out.
单项选择题 He felt a bit （） because her life seemed completely out of balance.
