A serious study of physics is impossible________some knowledge of mathematics.(2013·大纲全国,31)
Crossing roads without taking traffic lights into consideration, ________ they are part of a crowd, has been labeled as the “Chinese style of crossing roads.”
—My son is addicted to computer games. He is hopeless, isn't he?—Yes, ________ he is determined to give up and start all over.
It hasn't been made clear ________ the new underground line is to be open to traffic.
The tour pal lost his way in the mountain; ________ made things worse was that it began to rain.
—Sir, I feel it complicated to apply to a university abroad.—Why not read our guide? This is ________ the relevant information is available.