根据句子意思，从方框中选用恰当的单词或短语填空。

lead to, fall behind, once a month, take care of , terrible, on business,closed, chopsticks, the most expensive

Simon works hard all the time so he won’t ________.
This is ________watch in the shop. I can’t afford it.
Amy goes to the reading club________.
It’s our duty to _______our parents when they are old.
A __________earthquake hit Nepal on April 25,2015 and many people gave a helping hand.
My father has gone to Hongkong __________. He will stay there for two weeks.
The local government _____ the factories which caused water pollution in that area.
Those western students in our school try to use ________when they have meals.