Working life prepositions and phrases

I work (a)   Microsoft company.

I'm in charge (a)   holding induction training.

I specialize (a)   online marketing and sales.

I mainly deal (a)   inquiries and bookings from a variety of clients.

I'm responsible (a)   planning and budgeting.

I'd like to introduce you (a)   my colleague Peter.

I'm very (a)   to meet you.

What do you do, (a)   ?

I'd like to keep (a)   contact.

I'm (a)   I have to go now.