Final answer:
The sentences can be completed with the verbs 'open' and 'turn on the light'.
Step-by-step explanation:
The correct completion of the sentences with the appropriate verbs would be:
a. Can you open the window, please?
b. Can I... Known on the light, please?
c. Sorry, I don't.
d. Can I... Known on the light, please?
Learn more about Verb completion in French