---- Hello, John. I haven’t seen you since we were at university.---- ________. It’s been a long time.
Evidence obtained from observation and experiment is often used to ________ a scientific theory.
.Faced with a problem,you have to ________ it first,and then try to find a solution.
Teaching pronunciation class to a mixed group of learners can ________ a teacher with many challenging problems.
All my pockets have been ________ but I can’t find my keys.
—OK,I’ve had enough of it.I give up. —You can’t________your responsibilities. (2012·江苏,26)