Here are the correct answers for the questions provided:

1. My mom often asks me to **clean up** my room on the weekend.
2. The Temple of Literature is one of the historic and **cultural** sites in Vietnam.
3. In 2003, four **stone tablets** of Emperor Ly Thanh Tong, Emperor Ly Nhan Tong, Emperor Le Thanh Tong, and Chu Van An were built in the Temple of Literature.
4. Liz: I am so nervous that I am putting on weight. Tony: **Eat less junk food**.