You are allowed to go out______ you promise to be back before 11 o'clock tonight.
The passage was very difficult, so in order to ______what the writer really wanted to convey, I read it many times.
--- Mr. Brown is an actor and most of his children take up jobs related to show business. --- ______, I guess. Ha! Ha!
It is said that a reliable treatment for the disease will be applied at least two or three months away and still it ______on animals.
Professor Lee arrived in Paris in 2009, ______, some time later, he was employed by a famous computer company.
--- Can I borrow this novel? ---Sorry. Only teachers and students in our school enjoy the ______.