Exercise 3: Choose the best option to complete each of the following sentences.

1. Posting personal pictures on social media is fun; ______, sometimes it can bring many problems.

A. although                   B. but                       C. so                         D. however

2. People tend to live ______ in fresh and open spaces in the countryside than in the polluted city.

A. healthilier                 B. healthier                C. more healthy         D. more healthily

3. They ran ______ through the forest passage than on their normal routes.

A. more enjoyed            B. more enjoyable      C. more enjoying       D. more enjoyably

4. You need to study harder and stay concentrated in class; ______, you won’t pass the test next week.

A. otherwise                  B. moreover               C. therefore                D. however

5. Alice likes playing chess because she thinks it can help her ___________ better.

A. connect                    B. show off                C. concentrate            D. keep fit

6.  Look! My uncle is _______ the goods from the back of the truck.

A. loading                       B. unloading               C. herding                     D. catching