Giúp em với em sẽ vote 5 sao cho ạ (>_<) cảm ơn 1. I adore ________with my best friends at the weekend. A. to hang out B. hang out C. hanging out D. to hanging out 2. If many animals and plants die , it will ___________our ecosystem A. balances B. Balance C. unbalance D. unbalances