Gerunds or Infinitives?

I'd be happy _________ (help) you with this.

Do you think he'd be interested in _________ (apply) for this vacancy?

This process has involved _________ (interview) a large number of people in every department.

Thanks very much for _________ (invite) us to look around.

This team is responsible for _________ (develop) a new product.

When do you plan _________ (take) your annual leave this year?

They want _________ (change) to a system of flexitime.

When did you decide _________ (requalify)?

We look forward to _________ (see) you on the 21st.

We have been looking at ways of _________ (offer) employees the opportunity to work more flexible hours.

I really dislike _________ (be) late for anything.

Would you like _________ (join) us for dinner?