I have already forgotten ______ you bought the computer.
The window ______ by Tom yesterday. Mr. White is repairing it now.
—Excuse me, Mr. Brown. ______ you speak Chinese?—Yes, butt only a little.
Either she ______ he is fit for the job, but not me.
Most of us found ______ difficult to finish the work in such a short time.
—Do you know where Mary is?—No, I don’t. I ______ her since last Sunday night.