Variant 1 You could have come first and won the race if you … faster

13. Your mother is recovering. You ... be worried.

A) should not B) have to C) must D) will not

14. I love the sight of ... on rose petals after a shower.

A) rainfall B) raindrops C) rainbow D) rainstorm

15. The leaders of the two countries ... an agreement to avoid future conflicts.

A) have recently reach B) have recently reached C) have been reached recently D) recently reach

16. Your relatives wear national costume on pedal days, … ?

A) are they B) don't they C) do they D) aren't they

17. Will she remember ... the bill? I told her she should do it today.

A) to pay B) pay C) paying D) be paid

18. Don't worry, we are quite flexible and can make changes at ... time whatsoever.

A) some B) no C) one D) any

19. I can't remember how it happened. I remember ... very tired, but that's all.

A) to feel B) feel C) feeling D) felt

20. The new method suggested by Mr. Saymanov ... a great increase in the economy of our country.

A) brought up B) brought about C) brought down D) brought over

Scientists have developed a new bionic computer chip that can coincide with human cells to combat disease. The tiny device, smaller and thinner than a stand of hair, combines a healthy human cell with an electronic circuit chip. Doctors can control the activity of the cell by controlling the chip with a computer. It has long been established that cell membranes become permeable when exposed to electrical impulses. Researchers gave conducted genetic research for years with a trial-and-error process of bombarding cells with electricity in an attempt to introduce foreign substances such as new drug treatments or genetic material. They were unable to apply a particular level of voltage for a particular purpose. With the new invention, the computer sends electrical impulses to the chip, which triggers the cell in order to correct disease tissues. It permits physicians to open a cell’s pores with control. Researchers hope that eventually they will be able to develop more advanced chips whereby they can choose a particular voltage to activate particular tissues, whether they be muscle, bone, brain, or others. They believe that they will be able to implant multiple chips into a person to deal with one problem or more than one problem.