If you are using the international "Solutions" series, you can find keys for various levels (Elementary to Advanced) at OnlineGDZ .
Find solutions for the basic level workbook (2011–2021 editions) on Skysmart . gdz angliiskii iazyk 10 klass rabochaia tetrad
If you tell me the or the specific name of your textbook (e.g., Rainbow English ), I can give you a direct link to those specific answers. If you are using the international "Solutions" series,