Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.
In modern times, people are facing all kinds of _____ although they are leading a comfortable life.
After the________ journey from Jiuzhaigou, Tom returned home, ________ .
For people who prefer ______ some time on the seaside rather than stay in the hotel, we can organize your trip.
I ________ with Hanmeimei on the phone _______ the light went out.
His injuries are serious but he is expected to _______.