Before the exams: 1)
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sure you have all the information you need about the exams - you don't want to waste time studying things you don't need to.

2) Make a revision timetable, and
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a record of all the work you do.

3) Don't
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up any new hobbies in the last weeks before the exams.

4)
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part in all the extra study classes you can.

During the exams:

5)
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care of yourself - eat well and get plenty of sleep. If you are tired and hungry you won't do very well.

6)
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sure you know when and where the next exam is going to be. Leave plenty of time to get there.

7)
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an eye on the clock during the exam. You don't want to run out of time!

8) If you find one question really hard, don't
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up, just go on the next question.

9)
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on thinking positive thoughts: "I can pass this exam. I will pass this exam!"

1. We never SMOKE cigarettes at any time. John always SMOKES a pipe but we PREFER cigars. 2. My wife's mother HAS BEEN LIVING with us for the last six months. 3. She IS GOING AWAY today. My wife IS HELPING her with
her packing now. 4. The boys HAVE BEEN EATING green apples all day.
Now they ARE ill, and their mother IS TALKING to the doctor on the phone.
5. The boys HAVE GONE to bed because they are ill. The doctor  HAVE prescribeD some medicine. Their mother IS GIVING them some now. 6. My brother usually VISITS his business friends two or three times a year. He
IS TRAVELLING in Germany at present. 7. She HAS READ many books on astronomy and so she really KNOWS the subject. 8.1 HAVE BEEN LISTENING to you for twenty minutes but I HAVEN'T understOOD anything.
People usually THINK first and SPEAK afterwards. 9. Peter HAS BEEN DRIVING a car for years but he HAS never driveN at night before. 10. John IS goING out).  He HAS just PUT  his coat on. 11. Peter HAS BEEN readING
in bad light and now he IS havING a headache. 12. Our train usually LEAVES at two o'clock. Father HAS BEEN traveLLING by that train every Friday for five years. 13. Look out of the window.IS IT RAINING? I hope not as I HAVE not BROUGHT a raincoat today.

1.There isn't ... homework for tomorrow.
1) much - потому что homework неисчисляемое существительное
2.Usually there is ... snow darung winter in Great Britain.
 3) a little - потому что snow неисчисляемое существительное
3.I want to know ... foreign languages. 
 2) a lot of - потому что language исчисляемое существительное и нельзя брать much или a little (a lot of употребляется и с исчисляемыми и с неисчисляемыми существительными)
4. How ... students are there in the class
3) many - потому что student исчисляемое существительное