Афанасьева, Михеева, Баранова, 7. Учебник. Unit 3. Step 4

1d, 2b, 3e, 4c, a — extra.

1) gone;
2) gone;
3) been;
4) gone;
5) been;
6) gone;
7) been.

A.
1) Continents: Africa, Australia;
2) Oceans: the Atlantic, the Pacific;
3) Countries: Canada, the USA, Australia;
4) States: Alaska, Texas, California;
5) Cities: Washington, D.C.;
6) Rivers: the Potomac, the Niagara;
7) Mountain chains: the Rockies, the Appalachians;
8) Others: the Great Plains, Death Valley.

1) desert air;
2) sudden discovery;
3) dangerous disease;
4) thick branch;
5) empty house;
6) long journey;
7) green leaves.

B.
True: 3, 4, 7;
false: 6;
not stated: 1, 2, 5.

1) gone;
2) been;
3) gone;
4) been;
5) been;
6) gone.

1) journey;
2) branch;
3) destroy;
4) empty;
5) leaves;
6) disease;
7) sudden;
8) suddenly.