1) I have been taking part in a school competition ______ three weeks. a) for b) since 2) My friends and I have been working on a really difficult puzzle ______ last weekend. a) for b) since 3) I have been practising my drawing skill ______ I was ten years old. a) for b) since 4) We have been playing a competitive online game ______ two hours. a) for b) since 5) I have been trying to find a solution to a maths challenge ______ the start of this lesson. a) for b) since 6) In my favourite game, we have been following the rules carefully ______ we started playing. a) for b) since 7) I have been watching a lot of online entertainment ______ last summer. a) for b) since 8) I have been trying to guess the answer ______ five minutes. a) for b) since 9) I have been ready to give up on this homework ______ this morning. a) for b) since

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