Luyện tập 12: Điền vào chỗ trống bằng cách sử dụng dạng so sánh tính từ cho các từ trong ngoặc:

1. My sister is (old)than me.
2. We always go camping when we go on holiday. It’s much (cheap)than staying in a hotel.
3. Math problems are (complicated)than English exercises.
4. Swimming in the sea is (dangerous)than swimming in a pool. 
5. The new smartphone has (attractive)design than the previous model.