Read the passage and select the most appropriate option for the specified blank. One day Mr. and Mrs. Brown went up to London to do some shopping. (1) ______ had a busy day, though in the end they did not (2) ______ very much and by about four o'clock they were both looking forward to having a cup of tea. They (3) ______ a restaurant but, just before they went in, Mrs. Brown remembered that she (4) ______ to buy some medicine for their son, (5) ______ had a bad cough. Select the most appropriate option for blank 2.

1. buy
2. buying
3. bought
4. buys