A hearty laugh relieves physical tension, ________ your muscles relaxed for over half an hour.
| A．to leave | B．left |
| C．leaving | D．leave |
It is important to introduce children to healthy nutritious foods from ________ they begin to eat solids.
| A．what | B．when |
| C．that | D．which |
Suppose we meet with a situation ________ none of us can deal with, what then?
| A．where | B．when |
| C．what | D．that |
It is announced that big prizes will go to ________ finishes the assignment on time.
| A．whom | B．who |
| C．whomever | D．whoever |
It remains to be seen ________ the newly formed committee's policy can be put into practice.
| A．that | B．which |
| C．what | D．whether |
Helen has just heard the news from her father ________ her boyfriend David will come back soon.
| A．when | B．how |
| C．which | D．that |