A fossil feather from the age of dinosaurs may explain why only some birds survived

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

B1. 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

Single choice

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 · Single choice

   Choose one answer.

   Choose the correct form: The feather ___ offer a clue.

   1. may
   2. mays
   3. may to
   4. may offering
   Check answers and explanations

   Answer

   may

   Use “may” with the base verb to express possibility.

2. Question 2 · Single choice

   Choose one answer.

   Choose the correct passive sentence.

   1. The fossil links to survival.
   2. The fossil is linked to survival.
   3. The fossil linking to survival.
   4. The fossil is link to survival.
   Check answers and explanations

   Answer

   The fossil is linked to survival.

   The passive form uses “is” plus the past participle “linked.”

3. Question 3 · Single choice

   Choose one answer.

   Complete the sentence: Scientists ___ more evidence before deciding.

   1. may needs
   2. may need
   3. may needing
   4. may to need
   Check answers and explanations

   Answer

   may need

   “May need” correctly expresses a possible future need.

4. Question 4 · Single choice

   Choose one answer.

   Choose the correct contrast word: A feather is small, ___ it may be useful.

   1. because
   2. but
   3. so that
   4. unless
   Check answers and explanations

   Answer

   but

   “But” joins two ideas that contrast with each other.

5. Question 5 · Single choice

   Choose one answer.

   Choose the correct sentence about past evidence.

   1. Fossils have preserved evidence.
   2. Fossils has preserve evidence.
   3. Fossils preserving evidence.
   4. Fossils have preserve evidence.
   Check answers and explanations

   Answer

   Fossils have preserved evidence.

   The present perfect connects past preservation with present importance.

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.