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.
| A．beneficial | B．optional |
| C．commercial | D．stressful |
. The thought worried him much ________ he might fail in the exam.
| A．that | B．which | C．when | D．so that |
. Now that energy prices are rising so rapidly, further prices are very uncertain, and the risk ________ a new investment depending on them may fail is greater.
. There are signs ________ restaurants are becoming more popular with families.
| A．that | B．which | C．in which | D．of which |
. There’s a feeling in me ________ we’ll never know what a UFO is – not ever/never.
| A．that | B．which | C．of which | D．what |
. The theory is of great important ________ the hotter a body is, the more it radiates.
| A．that | B．when | C．which | D．what |