These dumplings are delicious.—Yes. But I think the ones with beef are ___________ of all.

With 4G mobile phones, people can even see each other as they talk. —-Really? Would you show me it, please?

People have lots of problems living in the central Australian desert, ____ the lack of water is the most serious one.

It was _________ difficult work ________ nobody can do it.

This is Jim. ______ twelve.