--- You know Brad Pitt is already fifty. --- You are kidding.He doesn’t look __________ .
.Clearly, in a system ______________ every decision is made on the basis of tradition alone, it may be difficult to achieve progress.
.It's reported that in the past 50 years around 80 percent of Beijing's courtyard houses ___________.
.If I ___________ you would drop in, I would have stayed home waiting for you.
.—When will you be back, Peter? —___________ a couple of days.
.. All books ___________ to the library more than three days late will be subject to a fine.