${11.}$ The rice was separated from the husk.
→ bị động QKĐ: S + was/were (not) + V3/ed + (by+O) + time
${12.}$ A fire was made by their camp by the boys.
→ bị động QKĐ
${13.}$ This house was built more than one hundred years ago.
→ bị động QKĐ
${14.}$ Millions of tons of rice are exported by Viet Nam every year.
→ bị động HTĐ: S + is/am/are (not) + V3/ed + (by+O) + time
${15.}$ Vietnamese people's Lunar New Year is celebrated by them around January February.
→ bị động HTĐ
${16.}$ Trees are usually planted in Vietnamese people's neighborhood by them after Tet holiday.
→ bị động HTĐ
${17.}$ How many festivals is celebrated in your community?
→ bị động HTĐ dạng câu hỏi Wh/H: Wh/H + is/am/are (not)+ S + V3/ed +(by+O) + time?
${18.}$ How many motorbikes are imported by Viet Nam a year?
→ bị động HTĐ dạng câu hỏi Wh/H
${19.}$ His book was published by the publisher in 1996.
→ bị động QKĐ
${20.}$ Our desk was repaired during the weekend.
→ bị động QKĐ
