Fill in the blanks:
1. The ninth Guru of the Sikhs was ______.(Guru Gobind Singh, Guru Tegh Bahadur, Guru Nanak)
2. ______ organised the Sikh youths into a fighting force called Khalsa Dal. (Guru Gobind Singh, Guru Tegh Bahadur, Guru Nanak)
3. Akbar had secured the co-operation of the ______ with his policy of amicable relations. (Rajputs, Marathas, Ahoms)
4. In Maharashtra, the ______ Marathas offered stiff resistance to and defended their independence. (Babur, Humayun, Aurangzeb)