Cho dạng đúng của động từ trong ngoặc: We must be ... (care) when we cross the road

Cho dang dung cua dong tu trong ngoac de hoan thanh cac cau sau
1 we must be ..........(care) when we cross the road.
2 nam is the.........(tall) of the three boys.
Tim loi sai trong cac cau sau
1.you look tired. You'd better staying inside at recess.