Воткнуть there is, there are, there was либо there were?1. .....a

Воткнуть there is, there are, there was либо there were?
1. .....a cake in the lunchbox. You can eat it.
2. .....a cake in the lunchbox. Where is it now?
3. .....ten chairs in the classroom yesterday, and now.....eight chairs.
4. .....two bananas in my bag. Who knows where they are now?
5. .....a nice little bird in the box. Look at it!