In the middle of February, the weather__favorable for work, the workers began to repair and secure the dam of the river.
A dog ran out ___ behind tha gate.
The car ran ___ the direction of Shanghai.
What animal can live both ___ land and ___ the water.
Mr Chen was ___ early thirthies when he went abroad to have his further studies.
Children often get presents ___ Christmas and ___ their birthdays.