It was in the small house _______ was built with stone by his father _______ he spent his childhood.

We need lots of ________ every day．

look at the menu for a few minutes beforeI decide—— Of course. ,sir.

When did your uncle arrive in China— He got to Guangzhou the morning of the 16th of April.

What are the young people doing there— They are discussing how to ________ the pollution in the river.