Put sugar into (boiled, boiling,boil) milk,than stir and cool.should i add (thickened,thickening,thicken) milk in your cooffee.you may add (grate,grated,grating) cheese in the dish.какие из трех слов правильные?

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a) Present Simple 
1 A lot of olive oil is used in Greek cooking.
2 Two hundred people are employed by my company. 
3 Ann is believed to be a very intelligent person. 
4 Many accidents are caused by drunk drivers. 
5 Arabic is written from right to left.
6 Stamps are sold in most newsagent's in Britain.
7 Smoking is not allowed in hospitals. 
8 Spanish is spoken in Peru.
9 Many books for children are published in Ukraine every year.
10 More chocolate is eaten in the US than in any other country.

b) Past Simple
1 My cat was hit by a car yesterday.
2 Those beautiful poems were written by my best friend.
3 Her new car was damaged very badly last night.
4 You were sacked because you didn't work hard enough.
5 The telephone was invented a long time ago.
6 My friends were robbed when they were doing shopping last week.
7 His decision wasn't regarded as wise from the very beginning.
8 I was given a prize only once in my life.
9 My dog was found in the forest and brought home yesterday.
10 The windows weren't shut when I came home.

c Future Simple
1 This house will be sold next month.
2 My work will be finally finished tomorrow.
3 A final decision will be made on Monday.
4 Dinner will be served in a minute.
5 That problem won't be solved until next week.
6 My new book will be published soon.
7 The money will be paid at the end of October.
8 Bill won't be invited to my party any more.
9 Your bicycle will be repaired as soon as possible.
10 A new airport will be built near here soon.