Chia động từ

I. Put the verbs in brackets in the correct form, present perfect or past simple.
1. “Where’s your key?” - “I don’t know. I (lose) _____________________it.
2. Mary (go) _______________ to Australia for a while but she’s back again now.
3. “Where’s Ken?” - “He (go) ____________ out. He’ll be back in about an hour.”
4. Look! There’s an ambulance over there. There (be) ________ an accident.
5. They’re still building the new road. They (not/ finish) _______________ it.
6. The police (arrest) _________ three people but later they let them go.
7. “Is Helen still there?” - “No, she (just/ go) _________ out.”
8. What do you think of my English? Do you think I (improve) _____________?