I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house. (2012·新课标全国,30)
As we know,Beethoven is the greatest musician ________.
A big disaster took place in ________1960s when I was in ________teens.
Scientists have found no ________of life on Mars so far,though great efforts have made on the research.
A lot of people were made tired of the lecture which ________as long as four hours.
I have to amuse myself by looking after my 10-month baby since I have nothing important to work________these days.