【题目】My sister plenty of volunteer work in the past seven years.

【题目】My little cat can walk _______ his two hands for a long time.

【题目】My husband always ______ me flowers every week before we got married, but now he never ________.

【题目】Please don’t talk in class until you .

【题目】Don’t be ________, and please speak loudly.

【题目】It's dark, but my father hasn't come back, so my mother is (worry) about him.

【题目】— Do you like apples? — ________.

【题目】I find it difficult (work) out the math problem.

【题目】--Can he _________?

【题目】Although it takes energy (change) something into something else, it's better than (throw) things away.