Q the flask containing acid burst 1 While mulling over various new methods 2 While the professor was mulling throughr

3.While the professor was mulling over various new methods.
11 years agoHelpfull: Yes(5) No(0)
3.While the professor was mulling over various new methods.
11 years agoHelpfull: Yes(5) No(0)
4.While professors was mulling over various new methods.
11 years agoHelpfull: Yes(3) No(15)
4th option cannot be de answer as "professors" is plural so it should be followed by "were" n not "was" ;"mulling" is a verb which literally means "thinking over or pondering over" so 2nd option cannot be de answer as mulling should be followed by "over" n obviously not by "through";1st option cannot be de answer as SUBJECT is not there so sentence gives a sense of incompletion.
10 years agoHelpfull: Yes(2) No(1)
3.While the professor was mulling over various new methods
11 years agoHelpfull: Yes(1) No(1)
ans 3)- while professor was mulling over various new methods,the flask containing acid burst.
since professors is plural
11 years agoHelpfull: Yes(1) No(1)
3.while the professor was mulling over various new methods.
11 years agoHelpfull: Yes(0) No(0)
3.While the professor was mulling over various new methods.
11 years agoHelpfull: Yes(0) No(0)
3.While the professor was mulling over various new methods.
11 years agoHelpfull: Yes(0) No(0)
3.While the professor was mulling over various new methods.
10 years agoHelpfull: Yes(0) No(0)
2.While the professor was mulling over various new methods.
9 years agoHelpfull: Yes(0) No(1)

Q.______________________,the flask containing acid burst.
1.While mulling over various new methods.
2.While the professor was mulling throughr various new methods.
3.While the professor was mulling over various new methods.
4.While professors was mulling over various new methods.