The two pens are the same, but the red one cost _____________ that one.
.--- Shall we go shopping together this afternoon? --- _______. I will be very busy then.
.________ the absence of any further evidence the police were unable to solve the murder.
.. The chair looks rather hard, but believe it or not, it is very comfortable _____.
.It was _____ his mother came in _____ to prepare his lessons.
._______ has already been pointed out, grammar is not a set of dead rules.