Тесты по 50 1. choose the correct world. the cycle is how moves and changes on the earth. a)air b) water c) wind d) heat 2. choose the correct articles. how do sun, air water make weather? a) -, b) the, a, the, the c) the, the, the, the d) a, an, the, the 3. lake baikal is deepest on earth. a) the, the, the the the, the d) a, an, the, the 4. choose the correct modal verb. people pollute rivers, lakes and seas. a) must b) should c) shouldn't d) have to 5.you never leave the tap open. a) shouldn't b) can't c) haven't to d) should