Direct object & indirect object

What is the direct object of this sentence:

I bought a new computer.

• I

• bought

• new

• computer

What is the direct object of this sentence:

We sent a birthday present to my mom

• We

• sent

• birthday present

• my mom

What is the direct object of this sentence:

The students found the exam to be difficult

• The students

• found

• the exam

• to be difficult

What is the indirect object of this sentence:

Marco and I visited my mom in New Jersey.

• New Jersey

• My mom

• I

• Marco

What is the indirect object of this sentence:

My friends baked a cake for me on my birthday

• on my birthday

• a cake

• My friends

• for me

What is the indirect object of this sentence:

The teacher emailed the grades report to the students.

• grades report

• the students

• emailed

• the teacher

In the following sentence, the underlined word is:

My dog gave me the toy

• Direct object

• indirect object

• I don't know

In the following sentence, the underlined word is:

The teacher explained the problem to the students.

• Direct object

• indirect object

• I don't know