They could speak French because they ___ (learn) French at school

I hadn’t heard about European inventions until I read the article. What happened first? A I learned about European inventions. B I read the article

I washed the floor after all the guests had left. What happened second?

Jean had left when the concert started. What happened first?

He was very tired because …

Indian mathematicians had used our system of numbers long before Europeans started to use it. Who first used our system of numbers?

I ___ (can't) take a photo because I hadn't charged the battery

The printer ___ (not work) because he hadn't turned it on

She wasn't hungry because she ___ already ___ (eat) dinner

The fire truck ___ (arrive) after the men had put out the fire

When they arrived at the station, the train ___ (leave)

Popov had already made a radio before Marconi invented his. Who invented the radio first?

I didn't pass my exam because …