Complete the sentence using the correct pair of antonyms.
The food will _______ flies, so we need something to _____ them.
admit to accept as true
advance to move forward
attract to be magnetic
casual not serious
compliment a nice comment about
deny negate
destroy to make unusable
discourage to take away hope
encourage to give hope to
fact a true statement
fiction pretend
formal very serious
gush to flow out quickly in a large amount
insult to say something mean or degrading
joyous happily
preserve to save
repel to push away
retreat to run away from
sorrowful full of sadness
trickle to slowly drip