1．________ about wild plants that they decided to make a trip to Madagascar for further research.
A．So curious the couple was B．So curious were the couple
C．How curious the couple were D．The couple was such curious
解析：此句的语序应该是The couple were so curious about wild plants that...，可以把so置于句首，后面引起倒装，所以要选B。the couple意为“夫妇”，作主语时，谓语动词用复数形式，可排除A和D，此句是so...that结构，所以选项C也可排除。
答案：B
2．Ronaldo was ________ to win the 100meter hurdles race，but he fell to the ground and missed the chance.
A．possible B．probable C．likely D．maybe
解析：possible和probable作表语时，主语只能为it或事物，而不是人；maybe为副词，它只能作状语，常常位于句子开头；likely作表语时，主语可以是人，也可以是物。
答案：C
