Delta Passenger Steals and Crashes Airport Tug at California Airport, Officials Say

Study the questions and tasks

Work through the material below, or start the interactive practice above to complete an attempt. Try the exercises before opening any answer or transcript sections, then use them to review your work.

Practice level

C1. Try this level if you can follow the instructions and understand most of the language; choose an earlier level if you need more support.

Question formats

Fill in the blank (dropdown)

How to approach this practice

Read the complete sentence and notice the subject, verb form, time reference and word order before answering.

1. Question 1 · Fill in the blank (dropdown)

   Choose the correct option for each blank.

   Although the tug was much smaller than an airplane, it ___ in a highly regulated area.

   Choices for blank 1

   1. operates
   2. operate
   3. operating
   4. operated
   Check answers and explanations

   Blank 1

   operates

   The present simple expresses a general operational fact.

2. Question 2 · Fill in the blank (dropdown)

   Choose the correct option for each blank.

   The article explains why operational zones ___ normally restricted.

   Choices for blank 1

   1. is
   2. are
   3. be
   4. being
   Check answers and explanations

   Blank 1

   are

   The passive present construction describes a general condition.

3. Question 3 · Fill in the blank (dropdown)

   Choose the correct option for each blank.

   Ground crews may need ___ vehicle movements after an unexpected incident.

   Choices for blank 1

   1. adjust
   2. adjusting
   3. to adjust
   4. adjusted
   Check answers and explanations

   Blank 1

   to adjust

   The modal “may need” is followed by a to-infinitive.

4. Question 4 · Fill in the blank (dropdown)

   Choose the correct option for each blank.

   The incident briefly disrupted operations after the man ___ onto the tarmac.

   Choices for blank 1

   1. go
   2. goes
   3. went
   4. going
   Check answers and explanations

   Blank 1

   went

   The past simple places both reported actions in the past sequence.

5. Question 5 · Fill in the blank (dropdown)

   Choose the correct option for each blank.

   The airport separates public spaces from operational zones, ___ helps protect aviation safety.

   Choices for blank 1

   1. what
   2. which
   3. where
   4. whose
   Check answers and explanations

   Blank 1

   which

   A nonrestrictive relative clause requires “which” here.

6. Question 6 · Fill in the blank (dropdown)

   Choose the correct option for each blank.

   If unauthorized access ___ unchecked, routine operations could become more hazardous.

   Choices for blank 1

   1. remains
   2. remained
   3. will remain
   4. remaining
   Check answers and explanations

   Blank 1

   remained

   The second conditional uses a past-tense verb in the if-clause.

7. Question 7 · Fill in the blank (dropdown)

   Choose the correct option for each blank.

   The event was brief, but it was significant enough ___ broader concerns.

   Choices for blank 1

   1. raise
   2. raising
   3. to raise
   4. raised
   Check answers and explanations

   Blank 1

   to raise

   “Enough” is followed by a to-infinitive expressing result or degree.

What to review next

After checking an answer, explain the rule in your own words and write a new sentence using the same pattern. Revisit any rules you could not explain.

A focused practice result shows how you did on these tasks. Use several activities across skills to decide what to study next; one practice score does not certify an overall CEFR level.