if because although so

Câu hỏi :

The UK Government ensures that  all schools  in  the UK (1)______ certain standards, and this includes independent schools as well as those that are (2)_____ by the Government.  All  qualifications  are  awarded  by  national  agencies  accredited  by the Qualification and Curriculum Authority (QCA), (3)____ the quality of the qualifications you will gain is guaranteed.