When did your brother __________ the army?A.join B. join in C. take part in
Some people won’t realize the importance of their health _____they have lost it.
I thought it was a good idea but he didn’t ______ me.
Call a taxi, ______ you will miss the train.
Don’t make ________in class.
_______ you do, don’t miss this exhibition, for it’s so hard for me to get the tickets.