=>
3. A -> are waiting
-> at the moment (thì HTTD, S is/am/are Ving)
4. D -> for three months 
-> for + khoảng thời gian (thì HTHT)
5. A -> Have (yet -> thì HTHT, Have/has S V3/ed?)
IV/
1. That apartment is the most modern apartment.
-> so sánh nhất tính từ dài the most adj
2. My father is interested in playing board games.
-> be interested in : thích thú, quan tâm
3. Your kitchen is bigger than my kitchen.
-> so sánh hơn tính từ ngắn adj-er than
4. I have played soccer for 5 years.
-> chuyển QKĐ sang HTHT, S have/has V3/ed, for + khoảng thời gian
5. My book is different from her book.
-> be different from : khác