we must _______ steps to safeguard our environment against these threats.

biologists ________ animals and plants into different groups.

modern farming methods have led to the total _______ of many species of wild flowers.

when someone loves none, he will ______ in love with anyone around him.

_______ of approach is an important prerequisite to successful learning.

i've no __________ of changing my plans just to fit in with his.

he continued to ______ up and down like a boy at a football match.

there is a __________ for a shop assistant on saturdays.

the course's __________ aim is to improve students' proficiency in oral spanish.

if they can __________ the deal, they’ll be able to retire.

how do you cope with the problem of poor ____?