+he is riding a bike now - ? what when +we are riding a bike now - ? what when

1.вы должны попытаться выяснить, так много фактов, как можно больше об этой экспедиции в антарктику.2.группа экспертов должны анализировать сложившейся ситуации связанные с экологическими проблемами нашего города.3.молодому инженеру разрешили применять мобильное оборудование в его экспериментах на поле.4.этот производственный процесс должен был быть улучшен новыми техническими средствами.

1. you should try to find out as many facts as possible about this expedition to the antarctic. 2. the team of experts is to analyze the present situation connected with our city's ecological problems. 3. the young engineer was allowed to apply the mobile equipment in his field experiments. 4. this production process had to be further improved by new technical means. 

my hobbyhobby is what a person likes to do in his spare time. hobbies differ like tastes. if you have chosen a hobby according to your character and taste you are lucky because your life becomes more interesting. the most popular hobby is doing things. it includes a wide variety of activities from gardening to traveling, from chess to volleyball. both grown-ups and children are fond of playing different computer games. this hobby is becoming more and more popular. making things include drawing, painting, handicrafts. many people collect something - coins, stamps, compact discs, toys, books. some collections have some value. rich people often collect paintings, rare things and other art objects. often such private collections are given to museums, libraries.as for me, i like to listen to music. 3 months ago my parents bought me a compact disc player and i decided to collect compact discs. i like different music, it should be good. i collect discs of my favourite groups and singers. i carefully study the information printed on discbooklets. i try to find everything about my favourite singers. also i like to watch music programmes on tv. i want to keep up with the news in the world of music.of course, i like to spend my spare time with my friends. we talk about all sorts of things ( politics, teachers, girls). we discuss films, books, tv programmes. in fine weather we like to be in the open air. we find a nice place somewhere in the forest. we make a fire, bake potatoes and have a lot of fun. when the weather is bad, my friends come to my place. we have a good time together.