Answer:
When on a business trip in China, avoid giving expensive gifts to your hosts; they may cause embarrassment or even be refused.
Step-by-step explanation:
The combination above includes the four original sentences into a compound complex sentence. The semi-colon links the two sentences and an implicit connector can be retrieved : since. The first part of this set of sentences: When on a business.......to your host has an adverb clause followed by a main clause ; (you) avoid giving expensive.... Then, after the semi-colon, a main clause runs: They may cause....., they refers to gifts .