1. The average rainfall in Arica, Chile is 0.76 mm per year. The average rainfall in the Libyan Sahara Desert is less than 15mm per year. (dry)

Arica, Chile is drier than Libyan Sahara Desert.

2. Henry arrived at the meeting at 7 o’clock. I arrived at 6:45. (soon)

I arrived at the meeting sooner than Henry did.

3. It costs 100 million dong to build a concrete bridge, but only 50 million dong to build a steel bridge. (expensive)

Building a concrete bridge is more expensive than building a steel bridge.
 

4. It takes Linh 45 minutes to load hay onto the cart, but his father needs only 30 minutes. (slowly)

Linh loads hay onto the cart slowlier than her father does.

5. His house’s yard is about 100 square meters while your house’s yard is about 50 square meters. (large)

His house’s yard is larger than yours.