Grammar Galaxies_Diving into the Past

What is the correct form for this sentence? "I ___ (read) a book when the lights ___ (go) out."

Identify the correct usage: "When the teacher entered, the students ___ (write) the test."

Which sentence correctly uses both tenses? "While I ___ (cook) dinner, my friend ___ (call) me."

Choose the correct tense: "This time last year, I ___ (travel) in Europe."

Choose the correct tense: "Yesterday, I ___ (go) to the market."

Identify the correct use of Past Continuous: "Last night at 9 PM, I ___ (watch) a movie."

Select the sentence that correctly uses Past Continuous:

Complete the sentence in Past Simple: "Last weekend, they ___ (visit) their grandparents."

Complete the sentence using the correct tense: "We ___ (walk) in the park when it ___ (start) to rain."

Which sentence is in Past Simple?