四幅图中能正确表示新中国成立以来人口自然增长率变化趋势的是（   ）

根据句意，用括号内所给动词的适当形式填空。(必要时加助动词或情态动词)
____ Mr Zhang ______(teach)us English three years ago.
____ Peter turned off the computer after he finished______ (write)an e-mail.
____ —Where's Miss Wang?一Look，she______(talk)with the students.
____ Mr Liu isn't here now．He______ (go)to Beijing.
____ The children will go to the zoo if it______ (not rain)this Saturday.
____ There______ (be) a meeting in our school tomorrow afternoon.
____ Mr Green______(watch)TV at this time last night.
____ You’d better______(eat)less food before you go to bed.
____ My teacher told me that light______(travel)much faster than sound.
____ English______ (speak) by many people in the world.

把下列句子改写成句式整齐的排比句。

    理想不是现成的粮食，而是一粒需要你去播种的种子，理想不是现成的画卷，而是一张白纸，需要你去描画，理想是一片荒漠，而不是葱茏的绿洲，你要去开垦它。