We need ___________ to help the disaster-stricken area.

We need to act quickly to _______ to climate change, or it will be a disaster for the whole planet.

For environmental safety, we need to find ways to reduce emission of fumes and smoke of factories.

We were quite impressed by the ______ students who came up with the answer to our question almost instantly.

We arranged to meet at the station, but she didn’t _______.

We have to suffer from traffic congestion and pollution every day.

We enjoy ___________ time together in the evening when the family members gather in the living room after a day of working hard.

We all regard pollution as a.......... matter to human beings.

We are surprised to hear that Rose and Jack have ________. They seemed very happy together when I saw them last in Hanoi.

We kept in _______for a while after college.