I don't know if his idea will _ _ (有效).
I don't know if his idea will _ _ (有效).
I don't know if his idea _____(有效) 这个空填什么
I don't know when he _(come)back.when he _(come)back,I will
I don't know if my boyfriend_ the truth,If he _ the truth,I'
i don't knoe which scarf i should choos.i don't know _ _ _ _
宾语从句I don't know _ to visit the old man.A whether B if
Where is Jack?Sorry.I don't know.Go and ask his brother.He _
I really don't know when your parents and brother _是will 还是
i don't know _ _ _(多少次) HE HAS TRIED.
( )I am,weak in English.I don't know _.
I don't know where I can post this letter .=I don't know _ _
I _ don't know what it is