To improve the quality of our products, we asked anyone ____________ had used the products for suggestions.
The wild flowers looked like a soft orange blanket _______ the desert.
________ 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.