How many times have you been to the Site of Zunyi Meeting? —In fact, it is the first time I ________here

It was three months later _____ he completed the jobwith difficulty.

Small blocks of time can also be made full ________ of ________ the problems in our study.

He loves reading, so he usually_______ a lot of money for books.

This picture was taken a long time ago. I wonder if you can ___ my mother.