As the world’s population continues to grow,the ________ of food becomes more and more of a concern. (2013·浙江,4)
John is very _____ --- if he promises to do something he’ll do it.
Compared with his sister, Jerry is even more ______ to, and more easily troubled by, emotional and relationship problems.
Frank put the medicine in a top drawer to make sure it would not be _____ to the kids.
You’d sound a lot more polite if you make a request _____ a question.
Many of the earth’s plants and animals have already ______ and several other species are endangered.