—Bob, look what you have done! You ruined the experiment.—It’s not my fault. I just carried out the instructions _____.
________ with so much trouble, we failed to complete the task on time.
The reform project _______ by Mr. White ________ at the meeting now.
Who________ for the pollution of our earth?
— So hard ______ in the past few months that he has made great progress in English. — I can see that; only a few mistakes ______ in the exam.
Seeing their son playing computer games all day, the parents don’t know ______ it.