told us the work would be finished by nextmonth, ________ personally I doubt very much.

（2011福州）—I often listen to the song Rainbow．—So do I．It________beautiful．

Riding bikes has advantages __________ driving cars ________ many aspects

It was considerate _____ you not to playthe piano while I was asleep.

Without proper lessons, you could _________a lot of bad habits when playing the piano.