It never occurred to humans until the mid-l990s some animals can be cloned.
The meeting was of _____, and the information he offered at the meeting was_____.
The reason_______ his coming to China was _____ he wanted to study Chinese medicine.
I was really anxious about you. You _______ home without a word.
This book _____ ten units, _______ three main revisions.
His uncle _____ until he was thirty-five.