Past Perfect/ Past Perfect Countinuons. СРОЧНО НАДО!
1)By the time Alexander was twenty he ________ (become) a professional scientist.
2)When Alex ________ (hang up) the phone he ________ (realise) he ________ (forget) to take down the caller’s name and number.
3)He ________ (work) in the laboratory for three hours when he stopped for a break.
4) Alex ________ (read) a book all night and was very sleepy the next morning.
5) They were exhausted because they ________ (play) chess all day.
6) Before Fleming invented penicillin, he ________ (experiment) with bacteria for a long time.
7) I ________ (decide) that I was going to study Chemistry before I finished secondary school.
8) Alexander ________ (already/learn) to read and write before he started school.
9) He was upset because he ________ (miss) the last train.
10) He ________ (reach) his house by the time it started to rain.