library books must be returned within three weeks.2.You should keep all medicine in a locked cupboard.3.Customers cannot exchange goods without a receipt.4.Patients should not take these pills more than twice a day.5.They may hoist the typhoon signal NO.8 later today.6.We will not allow children wearing school uniforms into Internet cafe.7.Can people use this shampoo every day?all medicine should be kept in a locked cupboardgoods cannot be exchanged without a receipt these pills should not be takenmore than twice a day. the typhoon signal NO.8 may be hoistedlater todaychildren will not be allowed to wearschool uniforms into Internet cafecan this shampoo be used every day?要休息啦，有問題，再重新發(fā)問吧，有別的哥哥姐姐幫你解答啦