________ you didn’t know the rules won’t be an excuse for your failure to report

________your sister__________—– She is friendly and helpful.

28. We have to set a definite date for the concert. The underlined word means _____.

I think the environment is becoming worse.—Yes, I really don’t know we can do about it.

from endless homework on weekends, thestudents now find their own activities, such as taking a ride together to watchthe sunrise