Although you have learned much knowledge and a lot of theories, the problem is _______ can be put into practice.

---Tell me something about your adventure in the rainforest, please.---We lost our way in the forest and ___ made matters worse was ___ night began to fall.

________ seems strange to us is ________ the troublesome boy is getting along well with all his teachers.

The reason _____ he was late for the meeting was ____ he was held up by traffic jam during rush hours.

Mo Yan, 2012 Nobel Prize winner in Literature, believes reading is　　　first stirred his imagination and gave him a way with words.