He offered to her a hand as the suitcase was too heavy for her to carry.
This is a very special flower and it can ________a strong sweet perfume at night.
The engineer has spent one year working in the US and discovered how things ________overseas.
In the 21st century, all nations must take their ________of responsibility for the global safety.
—I have just received another message, telling me I have won a big prize. —Don't jump on it. You ________.
— Do you mind if I leave my car here for a minute? — ________.