—The room is so dirty, _____ we clean it?—Of course.
Nowadays everything strange is____strange. That is to say, any unexpected ____thing is possible to happen.
Hello.You_____ 68442936. I’m sorry I’m unable to answer your call right now.
________ him before, I didn't recognize him.
As a teacher, I seldom give my students so difficult a problem ________ they can not work out.
None of us had expected the middle-aged engineer died ____ his design uncompleted.