Verbs that Require an -ing Form in the Complement

Remember that the following verbs require an -ing form for a verb in a complement:
admit
appreciate
avoid
complete
consider
delay
deny
discuss
enjoy
finish
keep
mention
miss
postpone
practice
quit
recall
recommend
regret
risk
stop
suggest
tolerate
understand

EXAMPLES:
She is considering not going.
We enjoyed talking with your friend.
EXERCISES:
Strauss finished ______ two of his published compositions before his tenth birthday.
a.written
b.write
c.to write
d.writing