3 The baby... (not/sleeps when Grandpa (arrive 4 While he (travel) on the bus work, he (remember) thail it was his wife's birthday.

3 The baby was not sleeping when Grandpa arrived.

4 While he was travelling on the bus work, he remembered that it was his wife's birthday.

Ответ: 3 The baby was not sleeping when Grandpa arrived; 4 While he was travelling on the bus work, he remembered that it was his wife's birthday.