帮我过过英语难关

1.Seven and eight is f_______

2.----Is twelve and fi sixteen?

----No,that not r_______.

3.T________and sixty is ninety.

5.Fifty and thirty is e_______.

6.We can use the d_______to look up the new words.

7.There are _______（三十一）days in March.

fifteen

right

thirty

eighty

dictionary

thirty-one