It is human activity has caused this global warming.
| A．which | B．that | C．what | D．why |
Doctors always tell us that drinking too much wine ______ our health, but some people don’t care.
| A．is harm to |
| B．does harmful to |
| C．is harmful to |
| D．do harm to |
Every member tries their best to finish the important work, ______ they aren’t permitted to go home on time.
| A．therefore |
| B．meanwhile |
| C．otherwise |
| D．somehow |
______ all of them are strong candidates, only one will be chosen for the post.
| A．Since |
| B．While |
| C．If |
| D．As |
When asked about their opinions about the schoolmaster, many teachers would prefer to see him step aside ______ younger men.
| A．in terms of |
| B．in need of |
| C．in favor of |
| D．in praise of |
Let’s learn to use the problem we are facing ________ a stepping-stone to future success.
| A．to | B．for | C．as | D．by |