After many failures the most difficult ______ is how to keep our strength up and fight again.
Have you seen Tom recently? I wonder ____ with his studies.
Lily has been in love with Tom ___ since she met him last year.
Students should form the habit of ____ everything important in class. Which of the following can’t be put in the blank?
---Where did you find the professor who made the speech yesterday? --- It was in the hall ____ the students often have a meeting.
Mr. Green has never smoked any more since his wife _____ him to give it up.