---Why didn’t you go to yesterday’s meeting?---I would have but I ______ too busy working on the important experiment.
Over the past decades, China _______ significantly under the correct leadership of the CPC, he said. The CPC's 18th National Congress will exert great influences on China's future and Africa highly expects of China's further growth.
It is in this laboratory ______ is run by Mr. Wu ______ the experiments are done.
He was really disappointed to find that he had failed to make himself ______, although he tried his best to describe vividly.
It is ______ that we can’t finish it on time.
He found that his house had been ______ and some important files were lost.