Answer key: TOEFL iBT · Build a Sentence · Science labs: equipment and experiments

For the teacher. Each answer comes with the reason it is right.

1. I'll check how many boxes we have left in the storeroom.
Extra chunk, not used: do we
2. No. When I got there, the machine had been taken away for repairs.
Extra chunk, not used: was
3. I know, which is why I'm repeating the experiment next week.
Extra chunk, not used: what
4. Not really. If I had gone to the training, I'd be more confident with it now.
Extra chunk, not used: would
5. That's strange. Why isn't it showing up in there? I uploaded it on Tuesday.
Extra chunk, not used: doesn't
6. Oh! So I could have gone home hours ago.
Extra chunk, not used: went
7. We ran out of the reagent and had to order more.
Extra chunk, not used: from
8. She said that the results hadn't come back yet.
9. Use the new one. It's far more accurate than the old ones.
Extra chunk, not used: most
10. Really? had I known that, I would have come in last weekend.
Extra chunk, not used: did