In my opinion, keeping dogs well ________ up is advisable for dog owners.
—Did you have any difficulty catching yesterday's lecture?—No. The professor spoke very clearly to make his speech easy __________.
You should understand the traffic role by now. You've had it __________ often enough.
I couldn't do my homework with all that noise __________.
With the financial crisis __________ across the globe, a lot of companies have shut down and many people have been out of work.
Students should have their homework __________ by themselves not by copying others'.