---Can you go to the concert with us on weekends ? ---_________, but I have to babysit my sister.
He studies ______ at Chinese for one year, but he can still_______speak it.
Spring is coming.I feel like __________weight (减肥).
The scientists in China are trying __________ the ways to reduce the fog and haze (减少雾霾).
I want to cook ________ for my parents.
----________ is he staying? ----For a month.