Complete using the present simple or the present continuous. They _______ (arrive) early. At the moment she _______ (sell) his vegetables every week at the market.

The correct answers are 'arrive' and 'is buying'. The first sentence describes a regular action, thus we use the present simple, and since the subject is 'they' the verb is 'arrive'. The phrase 'At the moment' indicates we should use present continuous for the second part. So the verb 'buy' should be changed to 'is buying' as the subject is 'she'. Therefore, the completed sentences are: 'They arrive early. At the moment she is buying some potatoes from Mr Green.'