As we all know, all living things __________ the sun for their growth.
| A．insist on |
| B．rely on |
| C．connect with |
| D．come on |
---Mary has been trained hard for the last two years.
---______ she did so well at the track and field meet yesterday.
| A．No doubt | B．No question | C．No wonder | D．No problem |
When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
| A．that | B．it | C．this | D．what |
One of the best ways for people to keep fit is to ______ healthy eating habits.
| A．grow | B．develop | C．increase | D．raise |
The building around the corner caught fire last night. The police are now ______ the matter.
| A．getting through | B．worki ng out |
C．looking into | D．watching over |
A survey was carried out on the sleep time of students in middle schools, ______ were surprising.
| A．its results | B．whose result | C．the results of which | D．of which results |