Chia động từ

Chia động từ
1) You ( be ) away?? Yes, I ( go) to my friend's coi trừ last week 
2) the friend ( open) a new internet house on Tran Hung Dao street ( be) clever 
3) these students ( learn ) english since they ( be) five 
4) Kangaroo ( see) everywhere in australia ( be) famous