a) Tom suddenly realized he'd forgotten ............(lock) his door.
b) On the way back we stopped ..............(have) some tea.
c) Could you stop ............. (talk), please.
d) Learning a language means ..............(be) interested in another culture.
e) Ann tried ............ (open) the window , but it was too high to reach.
f) Please remember ............(take) the dog for a walk.
g) Cathy says she'll never forget ........... (sky-dive) for the first time.
h) I don't really remember ............(start) school when I was five.