Researchers are tracking Monarch butterflies to learn more about their journey

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.

   Researchers ___ tiny transmitters to Monarch butterflies as migration begins.

   Choices for blank 1

   1. are attaching
   2. is attaching
   3. are attach
   4. attaching
   Check answers and explanations

   Blank 1

   are attaching

   The present progressive describes an activity happening around now.

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

   Choose the correct option for each blank.

   The project is designed ___ a clearer picture of the journey.

   Choices for blank 1

   1. provide
   2. providing
   3. to provide
   4. provided
   Check answers and explanations

   Blank 1

   to provide

   Designed is followed by a to-infinitive expressing purpose.

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

   Choose the correct option for each blank.

   Tracking data enables researchers ___ a broader understanding of the route.

   Choices for blank 1

   1. develop
   2. to develop
   3. developing
   4. developed
   Check answers and explanations

   Blank 1

   to develop

   Enable takes an object followed by a to-infinitive.

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

   Choose the correct option for each blank.

   The timing is significant because the butterflies ___ a major movement stage.

   Choices for blank 1

   1. begin
   2. are beginning
   3. beginning
   4. begun
   Check answers and explanations

   Blank 1

   are beginning

   The past participle follows are in the passive construction.

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

   Choose the correct option for each blank.

   The researchers want to determine ___ the pauses occur.

   Choices for blank 1

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

   Blank 1

   where

   Where introduces the embedded question about location.

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

   Choose the correct option for each blank.

   The devices may allow scientists ___ movement without relying solely on sightings.

   Choices for blank 1

   1. investigate
   2. investigating
   3. to investigate
   4. investigated
   Check answers and explanations

   Blank 1

   to investigate

   Allow takes an object followed by a to-infinitive.

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

   Choose the correct option for each blank.

   The information could make the migration easier ___ as a continuous journey.

   Choices for blank 1

   1. understood
   2. understanding
   3. to understand
   4. understand
   Check answers and explanations

   Blank 1

   understand

   Make plus object is followed by a bare infinitive.

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.