Genetically modified pig kidneys help two patients reach human kidney transplants

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 patients _____ alive long enough to receive human kidneys.

   1. stay
   2. stays
   3. stayed
   4. staying
   Check answers and explanations

   Answer

   stayed

   The past tense stayed matches the completed event in the report.

2. Question 2 · Single choice

   Choose one answer.

   Choose the correct connector: The kidneys supported patients _____ human organs became available.

   1. until
   2. although
   3. unless
   4. because
   Check answers and explanations

   Answer

   until

   Until shows that support continued before another event happened.

3. Question 3 · Single choice

   Choose one answer.

   Choose the correct passive form: The result _____ by NPR on September 7, 2026.

   1. reports
   2. reported
   3. was reported
   4. is reporting
   Check answers and explanations

   Answer

   was reported

   The passive was reported focuses on the result receiving the action.

4. Question 4 · Single choice

   Choose one answer.

   Choose the correct modal: The finding _____ draw attention to kidney shortages.

   1. must
   2. may
   3. had
   4. did
   Check answers and explanations

   Answer

   may

   May expresses a possible future result, not a certain one.

5. Question 5 · Single choice

   Choose one answer.

   Choose the correct relative word: The patients received kidneys _____ had first supported them.

   1. who
   2. where
   3. which
   4. when
   Check answers and explanations

   Answer

   which

   That correctly introduces a relative clause about the kidneys.

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.