---Tom has failed again in the math exam. I am really let down.---______ He has already done his best.
I want to know _____.
Don't have your children _____ for hours reading books in _____ dark a room.
Liaocheng, Shandong Pro. is a beautiful city, ____11 pay a three-day visit.
The teachers are doing what they _____ their stuaits.
They were _____ inventors than pure scientists.