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（友情提示：鼠标拖选单词即时翻译）
1. It is on 1st Sept. _______ students go back to school every year.
A. that B. when C. who D. what
2. When the children were told that they could go to the USA with their father,
they could _______ to tell their best friends.
A. not call B. never wait C. hardly call D. hardly wait
3. What he said just now got all of us _______.
A. disappoint B. to disappoint C. disappointed D. disappointing
4. —Kayla, we are taking a boat trip to Hawaii tomorrow. Would you like to go with us?
—That sounds exciting. I’d like to, but I can not. _______.