1, Freezes

2. Goes

3. Will get

4. Can't

5. Won't work

6. Are

7. Don't/won't work

8. Will rise

9. Boils

10. Goes

11. saw/ would

12. was

13. snows/ will go

14. will lend/ would have asked

15. was visited/ would see

My answers:

$1.$ Water .............freezes............. (freeze) if the temperature falls below zero.

$2.$ If he’s angry, his face always .....goes.....(go) bright red.

$3.$ If you put your money in a savings account, you .....will get........(get) ten percent interest.

$4.$ If the microphone isn’t working, you ...............can't hear......... (can/ hear) what he’s saying.

$5.$ The radio .......won't work..................(not work) if the batteries are flat.

$6.$ If there ....................is.................(be) only a few students, we usually close one of the classes.

$7.$ The machine ..........won't work......... (not work) if it doesn’t have enough oil.

$8.$ If a balloon is filled with hot air, it .....................rises.........(rise).

$9.$ If water .................boils............ (boil), it changes into steam.

$10.$ The machine stops automatically if something .............goes..............(go) wrong.

$11.$ If he ...................see...............(see) me here, he ........will be..................... (be) really angry.

$12.$ Mary ................will be...........(be) worried if you don’t come to the airport.

$13.$ If it .....snows.....  this winter, we ....might go..... (go) skiing.

$14.$ I ......will lend..... (lend) them some money if they ........ask.............(ask) me.

$15.$ If you ..visit.(visit) Oxford, you will see (see) some interesting old buildings.