Good technique in medicine means less pain and fewer deaths; __________, it is our duty to master it.
| A．thus | B．therefore | C．otherwise | D．however |
I don't know if you noticed their behaviors or not, but we______.
| A．were | B． have | C． had | D． did |
Here is the tower, ______ top you can have a good view of the whole city.
| A．from whose | B．from its | C．over whose | D．whose |
People in industrial countries take in as they actually need every day.
| A．twice as much protein | B．protein as much twice |
| C．twice protein as much | D．protein as twice as much |
To meet the challenge, the young people preferred heavier work to do in their spare time.
| A．to have given | B．to be giving | C．having give | D．to be given |
--- What has happened to Alice ?
--- I don’t know. She her job.
| A．can have lost | B．may have lost | C．should have lost | D．need have lost |