Singapore Botanic Garden

Don't know if it's appropiate to ask for IDs of plants overseas !
These were shot in Singapore Botanic Garden in March this year,
but still cannot find their IDs. The orange flowers seem to be
some kind of ginger flower, but cannot pinpoint which. The
others are fruits, may be not native in Singapore. Kindly take
a look and ID please. Thanks a lot.

 

1. Looks like Heliconia.

HELICONIA ORANGE - Google Search

2. Looks like Dillenia seed pod.

dillenia seed pod - Google Search

3. ???
4. Looks like Averrhoa bilimbi.

Averrhoa bilimbi - Google Search

 

Thanks very much for your speedy reply.
Will look up immediately.