[填空题]My computer has just (attack)（）by an unknown virus.

[填空题]My computer has just (attack)（）by an unknown virus.

[填空题]My computer has just (attack) （　） by an unknown virus.

[填空题]My computer has just (attack) ______ by an unknown virus.

[填空题]The strain of avian influenza virus that has led to the deaths of 140 million birds and 60 people in Asia in the past two years appears to be slowly acquiring genetic Changes typical of the "Spanish flu" virus that killed 50 million people nearly a century ago, researchers said yesterday.
How far the "bird flu" virus has traveled down the evolutionary path to becoming a pandemic virus is unknown. Nor is it certain that the much-feared strain, designated as influenza A/H5N1, will ever acquire all the genetic features necessary for rapid, worldwide spread.
Nevertheless, the similarities between the Spanish flu virus of 1918 and the H5N1 strain slowly spreading through Asia provide unusually concrete evidence of how dangerous the newer virus is. At least four of its eight genes now contain mutations seen in the deadly strain that circled the globe during and after World War Ⅰ.
The comparison of the old and new flu viruses is the first practical use of a science use of

[填空题]Dear Hilda,
I’ve just heard of my mother has suddenly been 85.______
ill, and I’d like to go and see what she is. The 86.______
trouble is that I can take Tom with me then. 87.______
Do you think if you would possibly able to look after 88.______
him for a week You have him for a week last year, 89.______
and you said he had been no trouble, but had got 90.______
on well with your little sister, Jane. 91.______
If I could have him, I would be able to bring 92.______
him along any time that suits for you. But if it is not 93.______
convenient, do hesitate to say so. 94.______
Yours,
Sarah

[填空题]Dear Hilda,
I’ve just heard of my mother has suddenly been 76. ______
taken ill, and I’d like to go and see what she is. The 77. ______
trouble is that I can take my son with me then. 78. ______
Do you think if you would possibly able to look 79. ______
after him for a week.’ You have him for a week last 80. ______
year, and you said he had been no trouble, but had 81. ______
got on well with your little sister, Jane. 82. ______
If I could have him, I would be able to bring him 83. ______
along any time that suits for you. But if it is not 84. ______
convenient, do hesitate to say so. 85. ______
Yours,
Sarah