there (be) more than 13,000 rhinos again living in the wild. These
16
rhinos (save) from extinction by the strong conservation
17
methods of local communities, government agencies, and private landowners. Wildlife
biologists still fear that some subspecies of the rhino in Africa and Indonesia (become)
extinct in the near future. Some scientists (believe)
18
that half of all animal species in zoos will also be in danger of
19
extinction by the middle of this century.
Because zoos want to treat animals humanely and encourage breeding, today animals
(Put) 20 in large, natural settings instead of small cages.
They (watch) carefully for any signs of disease and (feed)
21
a balanced diet. Most zoos (have)
22 23
specially trained veterinarians and a hospital for animals.
They also have specially trained keepers. Food (prepare) in
24
the zoo kitchen. The food program (design) to satisfy the
25
animals' particular needs. For example, some snakes (feed)
26
only
once a week, while some birds (feed) several times a day. Today zoo
27
animals (treat) well, and zoo breeding programs are important
28
in the attempt to save many species of wildlife. I. ,: .l,i, J,'10-5 The passive forms of the present and past progressive
I PAST PROGRESSIVE
AcTNJ3 PASSNE
The secretary is copying some (a) Some letters are being Passive form of the present progressive:
letters. copiod by the secretary.
Someone is building a new (b) A new hospital is being
hospital. built. are
The secretary was eopyr'ng (c) Some letters wsrs bdng
some letters. copied by the secretary.
Someone was buddtnp - a new (d).. A new hos~ital was beim -
hospital. built.