Fourteen and fifteen are t____.还有Twenty and thirte is f____.14和15是……?

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Fourteenandfifteenaret____.还有Twentyandthirteisf____.14和15是……?Fourteenandfifteenaret____.还有Twentyandt

Fourteen and fifteen are t____.还有Twenty and thirte is f____.14和15是……?
Fourteen and fifteen are t____.
还有Twenty and thirte is f____.14和15是……?

Fourteen and fifteen are t____.还有Twenty and thirte is f____.14和15是……?
Fourteen and fifteen are twenty-nine.14加上15等于29
还有Twenty and thirte is fifty.20加上30等于50

14+15=29 twenty-nine
20+30=50 fifty

没看懂~要求是什么呢?