TOEFL

To investigate a matter in order to learn more about it

To keep something at a particular level, standard, or condition

The part of a stated group or total that is more than half

Possible to deal with using the available time, effort, or resources.

The largest amount, number, or degree allowed, possible, or observed within a stated scope

The smallest amount, number, or degree allowed, needed, or observed within a stated scope

A part of a stated group or total that is less than half

To change particular features of something, often to make it suit a purpose or condition

Used to introduce a point judged more important than one already mentioned

Used to add another related point, often one that strengthens the point just made

Involving or consisting of more than one person, thing, or part

Shared between people or groups, often in feelings or actions toward one another.

Used to identify exactly the people, things, or details referred to in the preceding statement

To reduce the range or scope of something

The essential character or qualities of something, not the natural world.

The state of being needed or unavoidable.

Used to say that something is not always true or does not inevitably follow

Many in number

A reason for opposing something, or an expression of that opposition.

Based on facts rather than personal feelings or preferences.

A result that an activity is intended to achieve.

Something one is required or expected to do.

Something that makes progress toward a goal difficult.

To get something, often through effort or a formal process

Sometimes, but not often

As the representative of another person or group

Generally, after considering the situation's main features and allowing for exceptions

Continuing at the time being discussed and not yet finished

Only when the stated necessary condition is satisfied