Complete the following sentences using past perfect, past Continuous or past perfect continuous. 1. They waited until

1. They waited until we were all there before they started. (Past Simple)2. I was sure that I had seen her somewhere before. (Past Perfect) 3. He left school by the age of sixteen. (Past Simple)4. I had gone to sleep by the time he arrived. (Past Perfect)5. He couldn’t write because he injured his hand. (Past Simple)