Present perfect

Fill in the gaps:I haven’t cleaned my room....

Fill in the gap:We have known each other.........seven years.

Fill in the gap:  What a nice smell! Mum has ..... baked a cake.

Fill in the gap: Paul has........ read forty pages.

Fill in the gap: Have you.....seen an elephant?

Fill in the gap:  I haven’t received your e-mail ....

Fill in the gap: Peter has read 10 pages of the book .... last Friday.

Fill in the gap: Have you ......been to London?

Fill in the gap:They have .....returned home from school.

Fill in the gap: We have ..........baked a cake before. We didn't have an oven.

Fill in the gap: I haven't seen you ....... ages.

Fill in the gap: We haven't visited our friends .......16-th of March.