【推荐1】In the U. K. , from August to October 2021, ________ the Delta strain was prevalent, the country reported 16 COVID-19 deaths per 100, 000 people. (用适当的词填空)

【推荐3】In mid-September, ________ their seedless white grapes ripen, local farmers are busy picking grapes to be transported to other parts of the country. (用适当的词填空)