The Spring Festival is the most joyful time of the year, but it can also be ______ . With all the traveling, visiting relatives, and gift-buying, the holiday can become a tense time for many families.
In the cross-lake swimming race, a boat will be ____in case of an emergency.
The teacher has a peculiar way of ______her student’s nervousness when then speak English.
It was already past midnight and only three young men ______in the house.
Modern plastics can ______very high and very low temperatures.
The company is atarting a new advertising campaign to ______new custumers to its stores.