13. Don’t worry! I'll _____ his safety.
| A．answer | B．answer for | C．reply to | D．See |
--How long are you staying? ---I don't know. ____.
| A．That’s OK | B．Never mind | C．It depends | D．It doesn't matter |
Fruit juices can be harmful ___ children’s teeth.
| A．for | B．toward | C．with | D．to |
--Have you fed the dog?---No, but ____.
| A．I am | B．I’m just going to | C．I’m about | D．I’m just going |
The farmers were more anxious for rain than the people in the city because they had more ______.
| A．at length | B．at last | C．at stake | D．at most |
As is often pointed out, knowledge is a two-edged weapon which can be used ______ for good or evil.
| A．similarly | B．widely | C．equally | D．properly |