He is unreliable. What he says _______ be believed. a. cannot b. must not c. may not d. might not

Jenny's engagement ring was precious! It _______ have cost a fortune. a. must b. should c. can d. needn't

_______ is the existence of a wide variety of plant and animal species living in their natural environment. . a. Biodiversity b. Conservation c. Globe d. Individual

Being listed as an endangered species can have negative EFFECT since it could make a species more desirable for collectors and poachers. a. awareness b. preservation c. support d. impact

Many nations have laws offering protection to these species, such as forbidding hunting, restricting land development or creating _______. a. agencies b. reserves c. awareness d. challenges

It is found that endangered species are often concentrated in areas that are poor and densely populated, such as much of Asia and Africa. a. disappeared b. increased c. threatened d. reduced

She ___ be ill. I have just seen her playing basketball in the school yard. a. needn't b. shouldn't c. mustn't d. can't

Frank's wallet is lying on the coffee table. He _______ it here last night. a. must have left b. should have left c. must be leaving d. needn't leave

Only a few of the many species at risk of extinction actually make it to the lists and obtain legal _______. a. protect b. protection c. protective d. protector

Hiking the trail to the peak _______ be dangerous if you are not well prepared for dramatic weather changes. You _______ research the route a little more before you attempt the ascent. a. might / can b. may / mustn't c. can /

15,589 species (7,266 animal species and 8,323 plant species) are now considered _______ risk _______ extinction. a. at / of b. on / in c. for / with d. in / at

I was reading the book last night before I went to bed. I never took it out of this room. It ____ be lying around here somewhere. Where ___ it be? a. might / needn't b. can / should c. shouldn't / may d. must / can

Known worldwide by its panda logo, World Wildlife Fund (WWF) is dedicated to protecting _______ world's wildlife and the rich biological diversity that we all need to survive. a. a b. an c. the d. Ø