—Do you know where David is? I couldn't find him anywhere.—Well, he ______ have gone far—his coat's still here.
The committee ___________ nine members.
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?