Metaphysical poetry is known for its use of stylistic features that include love poems, religious and meditative lyrics. As a matter of fact, probably the most fascinating characteristic of the metaphysical verse is the application of religious images and ideas to human love, and the other way round, the application of the language of love to refer to a religious experience. Such is the case of Donne's Holly sonnets.
Corruption in African countries is hindering economic, political and social development. accessed public services, such as health care and education, paid a bribe in the previous year.
Is - two billion dollars is a unit, one unit so it is singular and you use the singular verb think - scientists is a plural, therefore, you must use the plural verb form of think