Scientists think they have found ancient signs of dinosaur blood

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

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.

   Scientists ___ many kinds of dinosaur remains.

   Choices for blank 1

   1. have studied
   2. has studied
   3. studied has
   4. have study
   Check answers and explanations

   Blank 1

   have studied

   Use the present perfect for research up to now.

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

   Choose the correct option for each blank.

   Some scientists think they ___ their strongest evidence yet.

   Choices for blank 1

   1. have found
   2. has found
   3. found have
   4. have finding
   Check answers and explanations

   Blank 1

   have found

   After “think,” use the subject and verb in this order.

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

   Choose the correct option for each blank.

   A footprint is a trace ___ by an animal.

   Choices for blank 1

   1. left
   2. leave
   3. leaves
   4. leaving
   Check answers and explanations

   Blank 1

   left

   Use the past participle in this passive phrase.

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

   Choose the correct option for each blank.

   Blood is soft, ___ bone is hard.

   Choices for blank 1

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

   Blank 1

   while

   “While” joins two contrasting facts in one sentence.

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

   Choose the correct option for each blank.

   If the evidence ___, it could give researchers another way to learn.

   Choices for blank 1

   1. is confirmed
   2. are confirmed
   3. was confirm
   4. confirming
   Check answers and explanations

   Blank 1

   is confirmed

   Use present simple in the “if” part of this possibility.

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.