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
B.On the hike, Mr. Clark tripped over a tree root, fell to the ground, and broke his wrist.
Parallel structure is using the same grammatical structure for a list of items or ideas. In option B, all of the actions in the list are written in simple past tense. They do not include a helping verb or other form. The verbs are all the same structure: tripped, fell, broke.
Option A is not correct. To make it correct parallel structure, "being responsible" should be "responsibility". To correct the parallel structure for Option C, "babysitting" should be "to babysit". To fix option D, add "having" before fierce determination.
Answer:
English is the most common language in the world, and the best choice for the second langu
Explanation:
First, most everyone in the world knew English.
Second, now, most company all choose English is the main language for most contract.
Third, a few years ago, America is the richest nation in the world ( now is china, based on business news ), so most countries want to exchange, travel, cooperate, we all need to know English, the mother tongue of American
