______addition to being creative, perseverance and diligence are necessary qualities to be a good scientist.[ ]

I heard Lucy ________ happily in her room when Ipassed her house.

―I am really struck by your spoken English. You speakso fluently. Have you been abroad―Yes. I ______ in London for two years.

etown,_______ I spent my happychildhood, has changed a lot

Something must be done to stop air pollution, ________ we will have no fresh air.