Look at the following pictures of different means of transportation.Match each description with the right picture and write down the word on the line 1 、 It is slow, but it is comfortable. It moves on the sea.It is a ______ 2 、 It is clean and fast. Pepole use it under the ground. It is a______ 3 、 It looks like a line of buses but it only moves on rails. It is a______ 4 、 It is a car to take passages where they want to go in exchange for money. It is a______ 5 、 It is the fastest and most expensive transportation means. It flies in the air. It is a______ 6 、 The number of the private______has been increasing fast. Many people have their own ones. 7 、 It can be seen in many big cities now. It is fast and it is just like a train in the air. It is a______ 8 、 It is one of the most common means of transportation in cities. It is cheap and conveninent but it is often very crowed. It is a______ 9 、 To Dalian horseback policemen______ are not just animals but also their close friends or family members. 10 、 Public______have become the most environmentally friendly means of transport in many cities.