We must do the experiment carefully__________Miss Liu told us.
The government requested that all the people ___________ in any indoor public area.
Scientists study ___________ human brains work to make computer.
A girl on the bus begin to sing a pop song and soon all the other students _________.
---Why were you late for school today? ----It was ________ I help catch a thief on the bus.
To tell the truth, it’s the first time that I _______ western food.