I am very sorry __________ this

I was beginning to realize that it does not _______ much whether a legend is true or not as long as it is beautiful [

The question ________ he should confess it or not troubled him greatly ( )

_______ it will do us harm or good remains to be seen

4I dont know____he will join us or not

_______________will not continue if an ongoing operation is changed or deletedA、

I had no ______of who I was or what I was going to be.

9． —Do you want tea or coffee?—I really don-t mind_________ ．

Either he or I ______to the airport.

—Which foreign language are you better at, English or French?—I am sorry I know _______of English and _______of French.

—Do you learn Russian or French?—I learn _____.

—Do you learn Russian or French?—I learn ______.