If it had been possible, I would have helped him, but I ______ too busy.
If ______ is a high-stress job, it is important that you learn how to relax after a busy day.
Eric will never win a gold in the swimming race ______ he works hard.
The solar-powered airplane Solar Impulse 2 arrived in Nanjing ______ April, 2015.
— Excuse me, could you tell me _______ ?—Of course. It’s ten minutes’ ride from here.
Mrs. White walks a dog in the park nearby every morning _______ it’s rainy or windy.