I hope you liked the concert last night— How on earth do you know I went to the concert I__________ you

______ it is raining hard , they are still working in the field.

We should _______/ki:p/ quiet in the library.

regret making the stupid mistake!— Yes. I yourdoing it another way at that time, but in vain.

Jim, who taught ________Chinese before you came to school—Nobody. I learned it by _______.