Chia dạng đúng của các từ trong ngoặc: One day, my uncle left work very late - about 7.30 pm. He ______ (be) very tired because he ________ (spend) the whole afternoon writing emails. When he left, he _________ (write) emails for more than three hours! He ______ (start) to drive home but he got stuck in a lot of traffic because there _________ (be) a very bad accident at seven o'clock. When he finally _______ (get) home, it was 9.40 - he ________ (drive) for almost two hours. Then he ________ (realise) that he couldn't get into his house because he _______ (leave) his keys on his desk in the office!