What can a Muslim do when dining with Christian friends who say grace?

> A grace is a short prayer or thankful phrase said before or after eating. The term most commonly refers to Christian traditions. -- Wikipedia Here's a Catholic example: > Bless us, O Lord, and these, Thy gifts, which we are about to receive from Thy bounty. Through Christ, our Lord. Amen. There's an implication of shirk in this passage, which is obviously unacceptable in Islam. In my experience, ordinarily the host (or one of the hosts) will stand up and say grace, while the remaining people bow their heads and remain silent. **Question**: What can a Muslim do when dining with Christian friends who say grace? I don't want to be unfriendly nor disrespectful, nor obstinate in religious matters. It seems like I could mentally replace "Christ" with "God", which seems like it would make the passage Muslim appropriate. Alternatively, I could say something like "in the name of God" (basically Bismillah in English), which would probably be not too off-putting.