1. You should try your best to get ___ rid of your bad habits within ____ short time.
A. a; a B. the; the C. /; the D. /; a
2. You will have to answer_____ your mistakes one day.
A. to B. for C. from D. against
3. Scientists ______ thousands of chemicals before they decided on the right one in the end.
A. tried out B. found out C. worked out D. turned out
