She ’s never been to Japan, ___________—_________. She went there last month.

In modern society, alternative energies __________traditional ones are playing an important role in our daily life. That’s justbecause scientists have made great breakthroughs _________ the development ofscience and technology.

man has his faults. We should, therefore, learnto be ________ of others.

Would you like some ______—Yes, please. I’m hungry.

______ riding shared bikes（共享单车）is an environmentally friendly way to travel，many of the bikes are thrown everywhere.