Choose the correct answer.

1) Life on other planets still............ a mystery.

A maintain

D proves

B remains C keeps

2) You should always............ new files on your PC.

B back up Cjustify

A support

3) Genes help us............. with illnesses.

A fight

B win

D hold

C face

D cope



4) How many planets comprise our solar

A system

B circle
C panel

D way
5) The company....... a new cell phone on the market. A presented B launched C revealed D started

6) Who....... in winning a Nobel Prize in Physics in 1964?

A succeeded

B managed

C achieved

D accomplished

7) That was a great breakthrough in scientific........... A investigation B process C research D trial 8 Check your PC's recycle.......... for the lost document.

A basket

B bin

C box

D bag

9) The Internet is a rich ..............of information.

A model

A influence

B power C source D link

10) Mobile phones may adversely ............ our brains.

B control C injure

D affect