"pants" (US) or "trousers" (UK) are plural therefore use "are", not "is". (this is confusing - why is "trousers" plural? Basically, because there are two legs (:D!). To make it singular, use the classifier "pair".
e.g.
This pair of trousers (pants) isn't dry.
compare with:
These trousers (pants) aren't dry.
Both are OK to use.
Also, in British English we use "trousers" because "pants" has a different meaning - "underwear".
You guys are Thai, so obviously, use whichever one you like.
1. These pants've got damp smell because..............copied...................
2. See! the right half is not equal to the left half. That's why they aren't completely matched.
1. These pants smell damp. It is raining so often that the pants don't have a chance to dry.
2. If someone does something really bad or evil, then when they die demons will come and take them to hell. (ในภาษาอังกฤษไม่แน่ใจว่ามัจจุราชเปรียบได้กับ Demons หรือ Satan หรือ Devils เพราะรู้สึกว่ามัจจุราชดูแลนรกแต่เป็นผู้คุมที่ดี แต่ในศาสานาคริสต์ ผุ้คุมนรกก็ไม่ดีเหมือนกัน อันนี้หากท่านอื่นมีคำแนะนำเพิ่มก็เพิ่มเข้ามานะค่ะ)
3. You should try to make both sides of the heart the same size. That way when you fold in the heart in the middle the sides will match.