The speaker had to get his voice ________ so as to make himself ________[ ]

The reason _____ being late for the meeting was _____ his little son fell ill this morning[ ]

__ in his book, he didn’t notice me ________ I entered the room

he Palace Museum has many arttreasures. In this sentence, "treasure" means ____.

－I’m sorry I ______ my exercise book at home.－Don’t forget_______ it to school tomorrow, please.