Julia is on maternity leave, so she.................be checking her corporate email constantly.

• doesn't have to

• has to

• don't have to

• have to

Answer explanation

Lack of necessity. She's on leave.

I already have my Op4 rating, so I ............. take it again until 2024.

• should

• needn't

• need

• have to

Answer explanation

Lack of necessity. It's not necessary to take the exam again until 2024.

Every time we are going to start our shift, the supervisor.................... brief us.

• should

• is required to

• need to

• need

Answer explanation

Strong necessity.

...................... find a solution to high noise emissions.

• We should

• We don't have to

• We needn't

• It's essential to

Answer explanation

Strong necessity.

In the USA, aircraft ........................ meet certain noise certification standards.

• is required to

• has to

• are required to

• should

Answer explanation

Strong necessity. Since it's a generalization, the plural is required.

Various entities.............................carry out runway inspections regularly.

• don't have to

• should

• have to

• has to

......................receive more training on human factors.

• We needn't

• We shouldn't

• We don't have to

• It would be a good idea to

Choose the correct function of the phrase or modal in green.

Different entities are required to carry out runway inspections regularly.

• Advisability.

• Weak necessity.

• Lack of necessity.

• Strong necessity.

Choose the correct function of the phrase or modal in green.

It's essential to put mobile phones away while working on the shift.

• Weak necessity.

• Strong necessity.

• Lack of necessity.

• Advisability.

Choose the correct function of the phrase or modal in green.

Controllers have to arrive 15 minutes in advance to their shift in order to be briefed.

• Advisability.

• Lack of necessity.

• Strong necessity / Obligation.

• Weak necessity.