【题目】We all know learning a language time and effort.

【题目】 he failed several times，he never gave up.

【题目】When the old man saw the great changes in his hometown，Shenyang，he could believe his eyes.

【题目】South China tigers are ，so we should try to protect them.

【题目】—If you have any questions，you can at any time.

【题目】—Our classroom is so clean. who’s cleaned it，Li Fei?

【题目】Baicizhan（百词斩）is useful app to learn English words.

【题目】—You look lovely in this new dress.

【题目】Please raise your hand if you know the answer. The underlined word means "________".

【题目】Can you tell me ________.