l transplants are no longer sciencefiction imagination ,”a surgeon has said,____that they are ___possiblebut technically complex

He smiled politely ________ Mary apologized for her drunken friends(2012·山东，27)

He’s got himself into a dangerous situation he is likely to be accused of meeting someone.

Tom doesn’t seem so enthusiastic as he was two years ago. — Yes. He’s really reached a point in his career ______ he has to decide what to do next.

If you want to be healthier, you must eat ______junk food.