--        does your sister practice singing English songs? ----Twice a week.

— Would you like to go hiking with me, Susan?—I’d like to, _______ you don’t want to go alone.

I didn’t know he came back __________ I met him in the street . 

Martin and his friends didn’t eat up all the food they ordered, __ they took the rest away.

The patients will have to wait all day ______ the doctor works faster.