Поставьте глаголы в активный или пассивный залог. 1.The surgeon (to use) artificial joints.
2.Some operations (to perform) on the open heart yesterday.
3.This textbook (to be) experimental.
4.This book (to read) with great interest by all the students.

1. Use.

2. Perform.

3. Be.

4. Read.

russia is a great powerful country. it   has its own codes of social etiquette.  both business  travelers and tourists   need to know them.  when you   meet a russian for the first time, you must shake hands firmly   and have eye contact. if you look    away it can be considered rude and indifferent. when pointing, do not use a single finger but point with your whole hand.  you must smile only when you mean it and are   pleased to meet someone.you mustn't  whistl indoors - it is a bad sign.  the thumbs-up sign is acceptable as a positive gesture. 

in   churches, women should cover their heads. men should remove their hats when entering any buildings. if you are invited to russian house you must buy a gift - swets, wine or flowers. entering a home you must remove your outdoor shoes - your hosts may offer you a pair of slippers.   russian schedules often change. you must know also that russian meetings never start in time. russians are great nation. you must respect us and our traditions.