Ответ:

  1. a) quick and convenient — the sandwich was invented as a convenient meal that could be eaten while playing cards.
  2. c) to have 5 o’clock tea — this is stated directly in the text.
  3. d) much bigger than they used to be — modern sandwiches are less elegant and often much bigger.
  4. c) Because sandwiches are easy and quick to prepare. The text also says that sandwiches can be bought in shops and restaurants.

Ответ: 1 — a; 2 — c; 3 — d; 4 — c.