. 1, Students will not be allowed into the exam room if they .............. their student cards. * 1 điểm hadn’t produced don’t produce didn't produce produced 2, My cat would not have bitten the toy fish ...... it was made of rubber. * 1 điểm if she has known had she known if she should know if she knew 3, . If that hat costs much, I .......... a small one. * 1 điểm would have bought will buy bought would buy chọn đáp án đúng