H.XXIII. Complete the text with the affirmative, negative or question form of the verbs in brackets.

Date: 2015-10-07; view: 1075.

H.XXII. Read the pairs of sentences. Cross out the incorrect word in the second sentence.

XXI. Put the words in these sentences in the correct order.

1. Deadlines /I /always /meet. I always meet deadlines.

2. minutes /usually /20 /drive /the /15 /takes /or.

3. often /he /to /on /Chicago /goes /business.

4. am /8 /o'clock /I /in /rarely /office /before /the.

5. often /overtime,/ works /she /but /never /for /she /it/ paid /gets.

1. He reads the Financial Times every day.

He always / rarely reads the Financial Times.

2. From time to time I forget to switch on my mobile phone.

I often / occasionally forget to switch on my mobile phone.

3. She doesn't go to fitness centres. She doesn't like them.

She sometimes / never goes to a fitness centre.

4. He often works at the weekend, and his children are always out with their friends.

He rarely / often spends time with his children.

5. My colleagues usually get to work after me.

I generally / sometimes get to work before my colleagues arrive.

What (do) does the body do to protect itself? Your body __________ (prevent) harmful microorganisms entering and causing harm. The skin, for

example, __________ (allow) microorganisms to enter. Hairs and mucus in your nose __________ (catch) invaders, and then you __________ (push) the mucus out when you cough, sneeze or blow your nose. Enzymes and acids in the body, and white blood cells also __________ (destroy) bacteria. __________ (help) antibiotics __________ ? Doctors __________ (use) antibiotic drugs to fight bacterial infections, but antibiotics __________ (work) against viruses. This is why doctors __________ (give) antibiotics to patients with a common cold or flu.

How __________ (work) immunization __________ ? Immunization

(or vaccination) is another way of protecting the body, by injecting the body with dead or inactive microorganisms. After vaccination, the body __________ (start) to make antibodies that destroy the microorganism. Because the microorganisms in the vaccination are not dangerous, the person __________ (get) ill. When they __________ (come) into contact with a live dangerous microorganism, then the

antibodies __________ (destroy) the infection before it makes them ill.