【题目】Life is full of ups and downs. ________ that we are optimistic and take a positive attitude, we will be more likely to enjoy our life to the fullest.
A.Concerned
B.Provided
C.Considering
D.Concerning

【答案】B
【解析】考查连词。provided that意为“如果，假如，在……的条件下”。句意：人生充满起起伏伏，如果我们都采取乐观积极的态度，我们将更有可能充分享受我们的生活。故选B。