—________is a boat ticket for children?—How old is your child? It’s free for kids under three years old.
The light______ by Edison is helpful for people.
—________do you practice your pronunciation? —I practice it _____ asking the teacher for help.
----Can you explain ______________________________, especially my writing? ----Of course. It’s my pleasure.
----It’s a wise _______ to wear a white tie. It matches your new suit well. ----Thank you very much.
----What’s wrong with you, Eric? ----________ to prepare for the coming exam last night.