Here are the correct answers for the questions provided:

Câu 3: We have travelled to almost every tourist attraction in... Africa
**C. the**
(“the” is used with specific geographical regions or continents)

Câu 4: The man... home when his car broke down.
**D. was driving**
(This indicates a past action that was ongoing when another past action occurred)

Câu 5: Binh is 1.80 meters tall, and Linh is 1.65 meters tall. Binh is _ Linh.
**C. taller than**
(Since Binh is taller than Linh)

So the answers are:
- Câu 3: C
- Câu 4: D
- Câu 5: C