How to use present perfect here?
1/ Look at this door! What a horrible color! Who --- (paint) it?
2/ What --- (you/do)? Your face is covered with dirt!
3/ Arthur --- (eat) the whole pack of crisps...
4/ As you --- (finish) your homework, you may watch TV.
5/ I am sure he --- (have) nothing to eat for days.
6/ He's late, I presume he --- (miss) his train again...
7/ How long --- (you/study) Japanese?
8/ That's the most incredible thing I --- (ever/hear)!
9/ He's covered in paint because he --- (spent) the weekend repainting the garage.
10/ We don't know where she --- (go), no one can find her...
11/ Maria --- (not/have) her breakfast yet.
12/ I --- (not/be) to her house since July.