The noise of the traffic sometimes is ___________.

We had to ________ a lot of noise when the childre

The usual symptoms of cavitation in a centrifugal pump is _____.A.noise and vibrationB.an

The birthday of the ______ is sometimes served as the National Day of Britain.A．head of th

______is sometimes called the "backbone of England".A．The Sperrin MountainsB．The Cambrian

The traffic was making so much noise that I couldn’t hear what he________ .A.is sayingB.wa

The question of ______ the traffic accident happened hasn been answered yet though the