1. The children played volleyball on the yard yesterday.
   Correction: The children played volleyball in the yard yesterday.

2. My apartment is on the two floor of the Spark building. Correction: My apartment is on the second floor of the Spark building.

3. The new robot in his palace is able does many things. Correction: The new robot in his palace is able to do many things.

4. She should reuses this bottle to contain water because it is still new and clean. Correction: She should reuse this bottle to contain water because it is still new and clean.

5. Electricity can be reduced if people turned off all the electric appliances in one hour. Correction: Electricity can be reduced if people turn off all the electric appliances for one hour.

Sửa on thành in =>. The children played volleyball in the yard yesterday.                                                                                                       Sửa Two thành second => My apartment is on the second floor of the Spark building.                                                                                Sửa Does thành to do =>The new robot in his palace is able to  do many things.                                                                                            Sửa Reuses thanh reuse =>  She should reuse this bottle to contain water because it is still new and clean.                                                    Sửa turned off thành turn off =>Electricity can be saved if people turn off all the electric appliances for one hour.