21. To many teenagers the cellphone is not only _____useful tool but also ____ way to have fun and be cool.
My friend showed me round the town,__________ was very kind of him.
They've won their last three matches,__________ I find a bit surprising actually.
Gun control is a subject __________ Americans have argued for a long time.
English is a language shared by several diverse cultures, each of __________ uses it somewhat differently.
Between the two parts of the concert is an interval,__________ the audience can buy ice cream.