Giúp mình mấy câu hỏi này với 1.When their dad came home, the kids _______ the Christmas tree. A. were decorating B. have decorated C. decorate D. are decorating 2.Thomas bought that pen at a low _______ at a local shop yesterday. A. fee B. salary C. fare D. price 3.You can find a lot of _______ information online for your project. A. usefulness B. usefully C. use D. useful 4. Binh has been trying to solve this problem all week, but he still hasn’t been able to _______ it. A. break B. shatter C. crack D. crash 5._______ the negative effects of plastic bags, they turned to paper bags instead. A. Have realised B. Having realized C. Have been realized D. Have been realising

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