АНГЛ Exercise 1. Answer these questions:

When were sulfonamides discovered?
When were sulfa drugs widely used?
What diseases do sulfa drugs treat?
Do sulfa drugs produce side-effects?

Exercise 2. Make up the sentences out of the words:

Treat, diseases, drugs, many, sulfa, infectious.
Prevent, mumps, sulfa, scarlet, drugs, fever, chicken-pox, and.
Sulfa, side-effects, sometimes, drugs, produce.
Sulfonamides, were, 1935, in, discovered.​

1they have been discussing some question  for an hour. 2where is sam?   he is in the room. he has been doing homework since he came back from school. 3mary has been practising on piano lately. 4how long have you been  learning the poem? 5the kid has been crying since his mom went to her work. i do not know what to do. 6this flower has not been growing since the weather changed. 7what have you been doing lately? 8my brothe is in australia now. he has been traveling for whole month. 9не понял 10 our neighbours have been screaming for whole morning to each other. it is interesting what is the matter. 11since when have you been working here? 12i have not been using this dictionary lately. 13who used my dictionary? 14why have you been cooking the salad for such a long time? 15my sister has been lying in the sun for a long time so she has red skin. надеюсь правильно