Fill in the blank with the correct form of the word in the bracket
1. Before a Vietnamese wedding, the betrothal presents, including areca nuts, betel leaves, tea, cake, wine, other __________ delicacies and money, are offered to the bride and her family. (variety)
2. It has become a norm that working mother can __________ to the household income. (contribution)
3. Thanks to great benefits of cyber – learning, many schools are redesigning their learning spaces to __________ virtual classrooms. (ability)