The two girls are so alike that strangers find __________ difficult to tell one from the other.
Listening to music enables us __________ relaxed.
His father __________ him for a doctor, but he preferred to be an artist.
__________to give up smoking, he threw away his __________ cigarettes.
He always __________ the mistakes made by his rivals.
He's decided to move to another city, because __________ doesn't agree __________.