A warm thought suddenly came to me __________ I might use the pocket money to buy some flowers for my mother’s birthday.
It was in the lab _____ was taken charge of by Professor Zhang ______ they did the experiment .
There was ______ time ______ I hated to go to school .
He made another wonderful discovery, ______ of great importance to science.
When they met again, the two friends talked about lots of things and persons ______.we could remember in the school.
The factory ______ I am going to is the place ______ my mother used to work many years ago.