How long do you think it will be ________ the computer company puts forward a new product?
--I'm sorry I made a mistake! -- . . Nobody is perfect.
One can always manage to do more things, no matter______ full one’s schedule is in life.
The police were seeking more information to find out________ killed the rich merchant.
Had they known what was coming next, they _________second thoughts.
Studying Tom’s menu, I found that many of the items are similar to ________ of McDonald’s.