Put the verbs in brackets in the correct form, present perfect or past simple

1.Where's your key? I don't know.I .... it(lose)
2.I ..... very tired,so I lay down on the bed and went to sleep(be)
3.Mary ........ to Australia for a while but she's back again now.(go)
4.Where's Ken? He ....... out. Ge'll be back in about an hour.(go)
5.I did German at school but I ....... most of it.(forget)
6.I meant to phone Diane last night but I ...... (forget)
7.I ....... a headache earlier but I feel fine now.(have)
8.They're still building the new road.They ..........(not/finish)
9.Is Helen still here? No,.... she out.(just/go)
10.The police ..... three people but later they let them go.(arrest)