(2013·甘肃兰州名校高三检测)The professor told me to start the research right now, ________ I was sure to fall behind.
A．or B．so C．but D．and
(2013·辽宁大连双基测试)________ a man's age, he can reduce it several years by wearing a confident smile.
A．Whichever B．Whatever
C．Whenever D．However
(2013·河北教学质检)After a year, doctors diagnosed him with a disease so rare ________ it affects just one in 8 million children.
A．after B．that C．as D．since
(2013·山东青岛2月质检)________ you need something, please don't hesitate to let me know.
A．Even though B．In case
C．As though D．Even if
(2013·河南开封四模)One more week, ________ we will accomplish the task better.
A．or B．but C．unless D．and
(2013·天津12区二模)He never thought that his success came ________ he least wanted it.
A．until B．since C．when D．while
