Step 1. Revision
Fill in the blanks.
1. Every year over 29,000 antelopes ________ (kill) in Tibet. are killed ---
一般现在时被动语态
2. In the past, the elephants __________ (kill) by farmers. were killed ---
一般过去时被动语态
3. In the past twenty years, a large number of bamboo areas ______________ (set up) to help pandas grow. have been set up ---
`现在完成时被动语态
4. WWF hopes that more and more wild animals _______________ (protect) in the future. will be protected --- 一般将来时被动语态
6. At present a new home ____________ (build) for pandas.
is being built --- 现在进行时被动语态
