Input:

In 1973, the United States and Communist China agreed to establish liaison offices in Beijing and Washington.

Sentence: The liaison offices opened at the same time

Output: It's impossible to say

Input:

How to post news articles on facebook<br>Visit the website of the news you would like to share. Make sure the article is not grossly offensive and does not contain nudity, as this violates facebook's policy. Copy the website's url.

Sentence: Facebook copied its policy from Instagram.

Output: It's impossible to say

Input:

"Child labor" is, generally speaking, work for children that harms them or exploits them in some way (physically, mentally, morally, or by blocking access to education).

Sentence: "Child labor" first began in the 1800s.

Output: It's impossible to say

Input:

How to use physical therapy to relieve back pain<br>Choose a physical therapist who specializes in back pain treatment. Make an appointment with your doctor to get a prescription for physical therapy. Ask the doctor to recommend a handful of physical therapists who have extensive experience treating cervical, thoracic or lumbar spinal pain.

Sentence: A psychologist is able to recommend a physical therapist that has experience in back pain.

Output:
It's impossible to say