Past perfect vs Past perfect continuous tense

He was disappointed when he had to cancel his holiday. (He/look/forward to it)

Find mistakes in the sentences below:

She had been waiting for the bus for an hour when it arrives.

Choose the sentence with the same meaning:

1. "David had gone home before we arrived."

Choose the sentence with the same meaning:

"Before I left the office, I had been working on the report all day."

Choose the sentence with the same meaning:

"After they had been traveling for several hours, they finally reached their destination."

By the time the concert ended, the musicians (a)   for three hours. (perform)

The light .............. before we got out of the office. 

When I arrived, everybody was sitting round the table and talking. Their mouths were empty, but their stomachs were full. They .....................

Correct the mistake: "When they arrived at the cinema, the film had been already started."

(a)  

1. Before the storm hit, they ........................... flowers in the garden.