2. (sell) the piano.

3. (play) the piano.

4. (cleaning) the piano.

5. (repair) the piano.

Fill in the blanks means:

1, buy, which means buy.

2. Sales means the exchange form of goods and money.

3. Terms of performance and opera music. ? Playing a plucked instrument is playing.

4. Cleaning means "cleaning".

5. Maintenance refers to maintenance and repair.