Past Perfect - 5th year

Complete the sentences with the correct past perfect or past simple form of the verbs in brackets.

Kevin ............ (go) home by the time I arrived.

Ethan suddenly realised that he ......... (leave) his laptop on the train.

Mum was annoyed because I .......... (not clean) my room.

Had they studied English before they .............. (go) to the USA?

We .......... (be) hungry because we hadn't eaten.

My phone didn't work because I ............ (not charge) it.

Why didn't you watch the film? .................... (you/see) it before?

Sally was embarrassed because she ............... (forget) her dad's birthday.