Cho dạng đúng của từ trong ngoặc

11. If Oliver (find)…………………………… money, he (not/to keep) …………………………… it. 

12. If they (not/wear) ……………………… pullovers in the mountains, it (be) ……………………too cold during the night. 

13. If Tony (know) …………………………… her phone number, he (not/give) …………………………… it to Frank. 

14. If we (not/visit) …………………………… this museum, we (not/write) …………………………… a good report.