Verbform

----- Nội dung dịch tự động từ ảnh -----
1. Some flowers
for his mother on her birthday yesterday. (buy)
2. Between 1442 and 1779, eighty-one exams
(hold) by the Le dynasty
3. No feasible solutions to this problem (put)
forward yet.
4. This computer
(use) for two years.
5. America .
(discover) by Christopher Columbus.
6. The Kyoto protocol (sign)
by 2003.