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Here are the answers with the underlined part that needs correction: 1. When Tom came to the station, the train **have** already left. (A) Corrected sentence: When Tom came to the station, the train **had** already left. 2. He spent most of his time **to** paint in the studio last weekend. (B) Corrected sentence: He spent most of his time **painting** in the studio last weekend. 3. Scientists **have researched since years** into ways of curing cancer patients. (A) Corrected sentence: Scientists **have been researching for years** into ways of curing cancer patients. 4. Many teenagers now prefer chatting on the computer **to meet** face to face. (C) Corrected sentence: Many teenagers now prefer chatting on the computer **rather than meeting** face to face. 5. Jackson wants to go to the music festival **on** Saturday, **and** he has a maths exam **on** that day. (B) Corrected sentence: Jackson wants to go to the music festival **on** Saturday, **but** he has a maths exam **on** that day. 6. **There is** an increase in house prices **last** year. (A and C) Corrected sentence: **There was** an increase in house prices **the previous** year. 7. It is very convenient **studying** with a smartphone. (B) Corrected sentence: It is very convenient **to study** with a smartphone. 8. A new road **is being plan** near my house **by** the government. (B and D) Corrected sentence: A new road **is being planned** near my house **by** the government. 9. Nam's house **is** very old, **but** he **is going to move** to a new apartment. (B and C) Corrected sentence: Nam's house **is** very old, **so** he **is going to move** to a new apartment. 10. She **was working** in the garden **when** the phone **was ringing**. (A and D) Corrected sentence: She **was working** in the garden **while** the phone **rang**.