Complete these sentences in your own words using the correct form.
a.I'll never forget ____when. I was young .
b.I'm thinking of _____next year.
c . I've always tried ____.
d. I'm looking forward to _____ during my summer holidays.
e. I remember ____ for the first time.
f. Our teacher always makes us_____.
g. I try to avoid ______.
h. I find it difficult ______.