So difficult _____ it to adjust to an English-speaking environment that he determined to learn English hard.
How he wishes he had a family _____ both his parents would treat him like a friend.
Before the opening ceremony of the supermarket, some workers are sent to _____ leaflets on the road.
The young teacher has been so ____ with work that she hasn’t had time for social activities.
We didn’t dare to make _____ sound for ______ fear of waking the sleeping baby.
—David, thank you so much for lending me your car this morning.—_____