After Jack had sent some e-mails, heworking on his project.
had started
has started
started
starts
—Can those________at the back of the classroom hear me? —No problem.
Attracting _____ senior citizens, Florida is _____ home to the largest population of elder Americans.
—Bob feels really sorry, Jean. — ______ I wouldn’t accept his excuses unless he takes back what he said.
These reference books donated by a non-profitable organization are available for ____ wants to have it.
---Haven’t seen you for ages! Do you still work in Guangzhou? ---______. It’s two years since I worked there.