Professor Lee arrived in Paris in 2009, ______, some time later, he was employed by a famous computer company.
______ has already been pointed out, grammar is not a set of dead rules.
There is a mountain ________ the top is always covered with snow.
---Why did the police _____ the crowd?---Because the presidents car ____ in the street.
John, as well as the other children who _____ no parents, ________ good care of in the school.
The poor children are looking forward to _____ a Christmas present that day.