Much of the power of the trade unions has been lost. _ , their political influence should be very great. (2006广东)
—Where did you get this book? —I picked it up from a secondhand bookshop if you ________ know.
When Harry was at college, he ________ go to the reading room after supper every day.
Don't be angry with us. We ________ with you together, but we were busy with our final reports when you called in.
Your teacher ________ very angry at that moment because you talked back to her like that.
Thanks to my teacher's valuable help, otherwise I ________ my college entrance exam.