37. We haven't traveled abroad for two years.
The last time we traveled abroad was two years.
38. My friend is a hard student. She always does her tests carefully.
My friend, whose tests are done carefully ,  is a hard student.
39. She can't contact her old friend because she doesn't have his phone number.
If she had  his phone number , she could contact her old friend
40. Peter found the visit to the gallery quite depressing.
 Peter felt  the visit to the gallery quite depressing.