He often gives me a lot of advice, most of _______ are very useful

​He often gives me a lot of advice, most of _______ are very useful
-> He often gives me a lot of advice, most of which are very useful (mệnh đề quan hệ)
=> Dịch nghĩa câu: Anh ấy thường dành cho tôi rất nhiều lời khuyên, hầu hết chúng đều rất hữu ích.