______ is it that metals plays such an important part in our daily life?
| A．Why | B．What | C．Where | D．When |
_______, he knows a lot.
| A．A child as he is | B．A child as is he | C．Child as is he | D．Child as he is |
—Do you mind if I take off my jacket?—_______.
| A．Of course not, make yourself at home | B．I’m glad if I can be of any help |
| C．Oh, thanks. That’s really nice of you | D．It’s really cold here |
To be successful, you must be smart, confident, and, ______ honest.
| A．therefore | B．above all | C．however |
D．after all |
I get the bicycle for _____.My friend
gave it to me when she bought a new one.
| A．everything | B．something | C．nothing | D．anything |
It’s really difficult to ______ what he is trying to express.
| A．leave out | B．break out | C．put  out |
D．make out |