The dark scares me, I know it's silly but I can't help it.

I would say either, let's look for my bike or let's search for my bike. To include the word 'go' in the sentence I would add 'and'. Let's go and look for my bike or let's go and search for my bike.

Absolutely no idea! Are you sure you have the correct spellings? In particular 'trough'.

They have different meanings. An alternative to the first sentence is 'He is the Vice Chairman'.

It is correct. Reporters ask questions to find out information and therefore learn.

Originally a 'Calling Card' was a card with a persons details left by someone who was unable to see the person they came to visit. Nowadays it's often used to describe an item left (for example in my garden 'hedgehog droppings' because I'm asleep when they are around) or a unique action made by animals or birds. In this case gannets. It can also be used to refer to a person but it's less common.

I haven't visited Madrid but would very much like to do so one day. If I were to visit, which places would you recommend to me?

Amongst is seldom used these days. You can use among.