找这个新大陆。be based on基于，所以选择C。

　　答案：C

　　5．We all can go out for a picnic this afternoon - ________ that the others agree.

　　A．to assume B．assumed

　　C．assume D．assuming

　　解析：assuming (that)．..假定......。类似表达有：providing/supposing that...。故选D。

　　答案：D

　　6．Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.

　　A．of；at B．by；in

　　C．of；on D．on；at

　　解析：句意为：科学家们坚信笑对身心健康有积极影响。be convinced of坚信，深信；effect常与on连用，意为"对......的影响"。以上两个均属于固定搭配。所以选C。

　　答案：C

　　7．After the traffic accident，no one ________ except a few people who were badly injured.

　　A．survive B．survived

　　C．was survived D．was surviving

　　解析：从句意分析可知，此处survive应表示"幸存"的意思，是不及物动词，不能用被动语态；由were可知用过去时态。所以选B。

　　答案：B

　　8．That money is ________ to me，but I haven't got it yet.

　　A．certain B．due

　　C．belong D．owe

　　解析：be due to sb.应支付给某人，是固定搭配；C、D两项形式不对。所以选B。

　　答案：B

　　9．Caroline doesn't have a gift for music，but she ________ it with hard work.

　　A．goes back on B．takes away from

　　C．makes up for D．catches up with

解析：考查动词短语辨析。句意为：卡罗琳虽然没有音乐方面的天赋，但是她用刻苦努力来弥补它。go back on背叛，背弃；take away from拿走，带走；make up for弥补；catch up