I smell something ________in the kitchen. Can I call you back in a minute?
The officials discussed the plan _________ last week in today’s meeting.
My boss command me ____ the same mistake again or I would be fired.
The college entrance exam is ______ important to the student, and it’s also challenging.
During that frightening war, these foreigners fought _______ us ________ the enemy.
I thought that maybe my words will play a role, but when I_______ her to give up smoking, I failed.