The police said they would not give up looking into other possibilities ____they find out what happened.

I think humour is a vital form of entertainment, ____ it makes us laugh and laughing keeps us healthy.

The UN is an important international organization _____helps many people around the world.

When you get on stage for the first time, you may be surprised by ______bright the lights are.

According to the rules of the factory, you can ask for leave ________ you have a doctor’s diagnosed note.

It is uncertain ___ side effects these weight-loss drugs will bring about, although hundreds of thousands of patients have taken it.

A survey showed that _______ Chinese kungfu movies remain popular among foreign audiences, Chinese directors and actors still lack international recognition.

______ he did not want to, he still had to share his hotel room with a stranger.

---Could we finish the project according to the schedule?
---I doubt that. The problem remains ______ we can get financial aid within this week.

Remember to give me a call ______ you arrive in Beijing.