After four years’ research, we now have a ______ better understanding of the disease.

 --When were the soldiers sent to the earthquake-stricken area? -- _______ the earthquake broke out.

— I hear your dad is ill. Is he ____ better? — Thanks. He’s fine now.

Passengers will likely face the usual struggle to get their tickets during festivals, __________ at railway stations, where long lines are expected. 

When talking about the Mid-autumn Festival, we ______ think of mooncakes and family reunion.