Circle the best answer among a b c a to complete the following sentences

circle the best answer among a, b, c, a to complete the following sentences
1. the official language in australia is               
A. italian B. greek C. chinese D. english
2. i find it hard to understand that foreigner because of his   
A.accent  B sound \C voice D volume
3. the train                at 7.30 tomorrow morning
A. leaved   B. leaves    C.  leaving    D. leave
4. i will visit my grandmother           sunday morning if i am not busy
A. at      B. in   C. on    D. of
5. Ba: " why don't we speak english during breaktime? " - An: "              "
A. no,thank     B. i'm fine    C. that's a good idea     D. yes, i'd love to 
6. did the storm cause any               to the local in the middle part?
A. damaged      B. damage         C. damaging         D. damages