Do they often donate vegetables to a __________ school in the village?

• B. nursery
  Explanation: A "nursery" school is a type of school for young children, which fits the context of a village school receiving donations.

Joe volunteered __________ English in our village last summer.

• C. to teach
  Explanation: The correct infinitive form to use with "volunteered" is "to teach."

The students __________ paper and bottles around the schoolyard this morning.

• D. picked up
  Explanation: The past tense "picked up" is used to describe an action that was completed in the past.

The club members cook food for __________ in Thanh Nhan Hospital every Saturday.

• A. patients
  Explanation: "Patients" refers to individuals receiving medical care, which is appropriate for a hospital setting.

If we volunteer, we can gain __________ experience and skills.

• A. valuable
  Explanation: "Valuable" describes experience and skills that are useful and important.

We believe that we can make a __________ in our community.

• D. difference
  Explanation: Making a "difference" means having an impact or effect, which fits the context.

When did you do volunteer work in __________ areas?

• C. mountainous
  Explanation: "Mountainous" describes areas with many mountains, which is the appropriate adjective here.

__________ voluntary work has become popular in our country in recent years.

• A. Doing
  Explanation: "Doing" is the gerund form used to refer to the action of voluntary work.

People can gain __________ and have lots of fun when doing volunteer work.

• B. confidence
  Explanation: "Confidence" refers to the feeling of self-assurance gained from doing volunteer work.

Let’s raise some money for __________ children in our town.

• C. disabled
  Explanation: "Disabled" is the correct term to describe children with disabilities.

My uncle started working for this non-profit __________ five years ago.

• B. organisation
  Explanation: "Organisation" (or "organization" in American English) refers to a structured group or entity, fitting the context of a non-profit.

Some of my friends often spend their summer vacations __________ the environment.

• D. helping
  Explanation: "Helping" is the gerund form used here to describe the action of contributing to the environment.

We __________ bottles to help the environment last week.

• C. reused
  Explanation: "Reused" is the past tense form describing the action of using bottles again.