Here are the completed sentences:

1. This dish has some meat, eggs and tofu.
→ There **are meat, eggs and tofu in this dish.**

2. This camera is not the same as the camera we wanted to buy yesterday.
→ This camera **is different from the camera we wanted to buy yesterday.**

3. I think learning to play the violin is more difficult than learning to play the guitar.
→ I think learning to play the violin is not **as easy as learning to play the guitar.**

4. The school library is to the right of the laboratory.
→ The laboratory is **to the left of the school library.**

5. The play is different from the original book.
→ The play is not **the same as the original book.**