When will the visas be ready, sir?—everything goes well, you should get them in 14 workdays

Not only________to turn off the lights in the kitchen，but we also failed to lock the front door.

Is _______ Qinghai-Tibet Railway plays an importantrole in China’s railway history the topic that you’re coming to

____ matters most inlearning English is enough practice.

Sally took a photo of her friends while they ______computer games.