Pierre Curie stopped his research and _______ Marie in the search of an unknown material.
第一节:单项填空(共20小题,每小题0.5分,满分10分) My father asked me to go on ______ walking tour, but I don’t think I’ve got ______ energy.
________the authorities continue to crack down football betting _________a new hope in the future.
—Why, Jack! Someone seems to have called you over there. —Yes? I ________ that.
—I wonder how much you charge for your services. —The first two are free, _______the third costs $30.
—When did you ________ to do the work? —Two months ago, we are through 80% of it at the moment.