_____ learn more knowledge, the students stay at school on Sunday.

The two companies are competing ___ each other to get into the Chinese market.

It seemed_____the world was_____ when the earthquake hit Wenchuan on May, 12th,2008.
A.as if;at an end                                        C.even if;in the end      
C.if;at the end                                    D.that;by the end

American English is more or less different____British English______pronunciation and spelling.

Can you tell me ___ which you based your calculation __ detail ?

My father warned me __________ going to the West Coast because it was crowded with tourists.

---Are you free after school?
---Sorry, I’ve planned to treat a friend of mine to dinner___for his help.

My head-teacher helped me a lot when I was in trouble. I do wish I could do something for him__________ one day.

We give dogs time, space and love we can spare, and ______, dogs give us their all.

They reacted violently _____ the news on yesterday’s newspaper.