Read this article, then choose the best sentences (a-f) to complete the gaps (1-4). Note that you will need only four of the six sentences given. It is sometimes difficult to refuse a gift without causing offence. Drug companies are now allowed to pay only economy air fares for doctors when travel is justified. However, a few other EU countries may have to change their culture to the demands of the new proposals. In reality, they do not even know that this code of practice exists. Invitations to sporting or other leisure events are no longer allowed, either. The code tries to respond to such criticism.