If you want to do the experiment again, you had better be more careful ________ you made a mistake.
A terrible earthquake happened in Wenchuan, _____drew the attention of the whole nation at once.
Dad ______ a lot of alcohol, but now he has given that up and ______ soft drinks.
The guards caught the spy and _____ him very carefully.
I have no doubt _____ he will get the first place in the competition.
He’s given me so much help that I really want to do something for him _____.