One more week, ______ we will not accomplish the task.

—I’m going to the post office.—      you’re there, can you buy me some stamps?

So quickly are science and technology advancing ________ is a possibility today may be a reality tomorrow.

________，Carolina couldn't get the door open.

　　　it is normal for parrots to talk, Einstein, a small bird, is unusual in that whenever she hears a new word or sound, she repeats it over and over until she masters it.