--Tree Planting Day is coming. Do you plant trees in spring?

---Yes, many trees ________ in our city every year.

A. are planting B. are planted      C. were planted     D. will plant

Tree Planting Day ________ in 1978．

1. A.
   was started
2. B.
   started
3. C.
   starts
4. D.
   has started

---Tree Planting Day is coming. Do you plant trees in spring?
---Yes, many trees ______ in our city every year.

1. A.
   are planting
2. B.
   are planted
3. C.
   were planted
4. D.
   will plant