The reason _______ he gives for not coming is that his mother is ill.
—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'.