________ the parents _________the son is enjoying the film. They laugh happily.

I’ve been waiting here____ morning; theyhaven’t showed up yet.

In the global economy, a new drug for cancer, _________ it is discovered, will create many economic possibilities around the world

Jim, as well as his sisters, to talk to his parents at present because of misunderstanding

The number of air crashes that ____ in developing countries ____ increasing. [ ]