Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.
| A．of; at | B．on; at | C．by; in | D．of; on |
— Martin was brave enough to dive from that 10-meter-high bridge.
— Yes. It is in his _______ to like taking risks.
| A．attempt | B．intention |
| C．nature | D．quality |
Mr. Samuel, _______ president of our company, is now in _______ possession of many branches across China.
| A．the; the | B．/; / |
| C．a; the | D．a; / |
Do you know ______ tomorrow?
| A．when does Tom come home |
| B．when Tom come home |
| C．when will Tom come home |
| D．when Tom will come home |
Mary is being punished by the teacher. That is _______ she broke the school rules.
| A．why | B．because of |
| C．the reason why | D．because |
By improving reading skills, you can read faster and understand more of ______ you read.
| A．that | B．which | C．what | D．how |