Предмет: Химия, автор: Geniusmaster

Чем отличаются друг от друга нуклеотиды ДНК?
а)строением азотистого основания.
б)строением углевода.
в)числом молекул фосфорной кислоты.

Ответы

Автор ответа: EkaEka9960
0
Правильный вариант ответа под буквой а)
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Exercise 1

Open the brackets. Use Past Simple Tense and Past Perfect Tense:

1. He ( to go ) for a walk after he (to wash) his car.

2. She ( to wash ) the window yesterday.

3. I (not to finish) my translation by 5 o`clock yesterday.

4. Ann ( to eat) the chocolates last night?

5. She ( to write) the letter and ( to send )it at once.

6. He ( to watch) this film by 7 p.m. yesterday.


Exercise 2

Open the brackets. Use Past Simple, Past Continuous, Past Perfect, Past Perfect Continuous Tenses:


1. By 2p.m. yesterday I ( to help) my friend to move from one apartment into another.

2. They ( to go ) to the seaside at that time yesterday.

3. Helen ( to cook) while Nick ( to wash) the car.

4. Roy (to fall) asleep before his parents (to return) home.

5. He (to live) in the city for ten years before he moved to the countryside.

6. The children (to play) in the garden all afternoon so their clothes were dirty.


Exercise 3

Fill in: on, off, through, up with ( Фразовый глагол PUT)

1. This work may be put___ till tomorrow.

2. Put ____ your cap. It’s hot.

3. I can’t put ____ rude people.

4. Due to bad weather they put ____ the party for a week.

5. Please, put me_____with this number.

6. I’m afraid you will just have to put ____ the pain for a day or two.


Exercise 4. Use TOO or ENOUGH


1. This book is ____ long for me to read.

2. The knife is not sharp ___ to cut meat

3. Is this boy good ____ for Mary to date?

4. She is ____stubborn to agree.

5. You don’t study ____.


Exercise 5. Word Formation


1. Everyone knows how important water is. Life on the planet would be _____ without it (POSSIBLE) .

2. My younger sister is so rude and _______! ( POLITE)

3. We don`t like to go to the shop because the shop assistant is very ____ there.( FRIENDLY)

4. Jack is an _____ person. He can`t help us. ( RESPONSIBLE)

5. What an___day! I have got two bad marks! (LUCKY)

6. It`s _____ to drive your car in a drunken state. (LEGAL)
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