May I smoke here? —If you _____, choose a seat in the smoking section.

Is Doctor Green ________ ORBIS doctor—No， he is ________UNICEF volunteer. But he sometimes works with ORBIS.

下列各句中，表达得体的一句是

The actress doesn’t care about the profits _______ sheplays her favourite roles

What _________ do you want to buy—Nothing. Thanks.