When ________, the museum will be open to the public next year. 

     A. completed      B. completing        C. being completed   D. to be completed

________ in 1636, Harvard is one of the most famous universities in the United States.

     A. Being founded   B. It was founded    C. Founded     D. Founding

The researcher is so designed that once ________ nothing can be done to change it

A. begins            B. having begun          D. beginning    D. begun

_______ such heavy pollution already, it may now be too late to clean up the river. 

     A. Having suffered    B. Suffering   C. To suffer      D. Suffered

最近你班將舉行一場(chǎng)題為 Life in the future 的討論會(huì)， 請(qǐng)根據(jù)以下要點(diǎn)， 寫一篇一百詞左右的發(fā)言稿。

1．      隨著醫(yī)學(xué)的發(fā)展，人類的平均壽命將會(huì)達(dá)到120歲。

2．      由于新能源的出現(xiàn)， 污染問(wèn)題將得到控制。

3．      人們的日常生活也將有很大的變化。 如機(jī)器人可以為你做家務(wù)；椅子的也按色能夠隨著你所穿的衣服而改變；受機(jī)可以帶在手腕上， 通話時(shí)可以看到對(duì)方；可以乘坐新型的電梯進(jìn)入太空度假。

在人群中，我看不見她了。(lose sight of)