1.A complaint letter should be ended (polite)
2.Some volunteer help to clear up the beach(conserve)
3.We can only get there by plane .There is no (choose)
4.They went to see most of the places (interest)
5. he got bad marks and failed his exams(lucky)
1. politely
V + adv
2. conservations
Some + (adj) + Ns
3. choice
no + N
4. interesting
adj + N
5. Unluckily
Đứng đầu câu = Adv
Nghĩa của câu `=>` Thêm “Un”.