July 20, 1969 was an important day. Two {#blank#}1{#/blank#} (美国) astronauts planted the first human footstep on the moon. {#blank#}2{#/blank#} (他们的) names were Armstrong and Aldrin. They went into a spaceship whose name was Apollo. As Armstrong reached his left foot {#blank#}3{#/blank#} （touch） the moon's surface, he said, "That's one small step for a man, but one big leap for mankind."

    {#blank#}4{#/blank#} two hours and twenty-one minutes, the man carefully at first and then {#blank#}5{#/blank#} (勇敢), walked on the moon, {#blank#}6{#/blank#} （take）photos and picking stones.

    After eight {#blank#}7{#/blank#} (day) stay in space, Apollo returned to the earth successfully. People everywhere were {#blank#}8{#/blank#} (excite) by this moon trip. "This is the {#blank#}9{#/blank#} (伟大) week in the history of the world since the Creation(创世)," President Nixon told the travelers. "{#blank#}10{#/blank#}（多亏，由于）what you have done, the world has never been closer together before."

    In Canada and the United States, people invite friends over for a meal, a party or just for coffee and conversation.

    Here are kinds of things people say when they invite someone to their homes:

    "Would you like{#blank#}1{#/blank#}(come) over for dinner this Saturday night?" "Hey. We {#blank#}2{#/blank#}(have) a party on Friday. Can you come?"

    To reply to an invitation(邀请), either say thank you and accept, or say you're sorry and give {#blank#}3{#/blank#} excuse. "Thanks, I'd love to. What time would you like me to come?" or "Oh, sorry. I have a ticke{#blank#}4{#/blank#}a movie."

    Sometimes, however, people use words {#blank#}5{#/blank#} sound like invitations but which are not real invitations. For example, “Please come over for a drink sometime." "Why not get together for a party sometime?" "Why don't you come over and see us sometime soon?"

    They are really just polite ways of {#blank#}6{#/blank#}(end) a conversation. They are not real invitations because they don't mention(提到；谈到) a certain time or date. They just show that the person is trying to be{#blank#}7{#/blank#}(friend). To reply to {#blank#}8{#/blank#}(expression) like these, people just say "Sure, that would be great!” or "OK. Yes, thanks."

    So next time when you hear such sounds like an invitation, listen{#blank#}9{#/blank#}(careful). Is it a real invitation {#blank#}10{#/blank#} is the person just being polite?

    Bike sharing is growing in popularity as a means of public transportation. It seems like a perfect solution{#blank#}1{#/blank#}China's heavy traffic.{#blank#}2{#/blank#}some local authorities(权威人士)say the bikes have become a nuisance and one Shanghai district has confiscated(没收)almost 5,000 bikes. The unregulated parking has caused continuous problems and{#blank#}3{#/blank#}(complain). Traffic police had confiscated the bikes because they had been {#blank#}4{#/blank#}(legal)parked.

    Shanghai is the world's largest bikeshare city with 280,000 shared bikes citywide. That number is expected{#blank#}5{#/blank#}(jump)to 500,000 by this June, according to Guo Jianrong, Secretary General of Shanghai Bicycle Association.

    Until the turn of the century, bikes were the main form of transport in Chinese cities. But in recent years, as Chinese have grown{#blank#}6{#/blank#}(rich)than before, bicycles{#blank#}7{#/blank#}(replace)by private cars, motorbikes and other public transport.

Bike sharing is hardly new, but what makes{#blank#}8{#/blank#} unique in China is that its usually station free—which means that users can leave the bikes anywhere they want. It's also cheap. Shanghai is not the only city{#blank#}9{#/blank#}bike sharing has had teething(萌芽的)problems. More than 500 bikes{#blank#}10{#/blank#} (rent)out by bike sharing firms were piled up in the southern city of Shenzhen in January.