____ he will come or not is still unknown.
| A．If | B．Where | C．That | D．Whether |
I’d rather the money went to a _______cause.
| A．valuable | B．rare | C．worthwhile | D．useful |
Parents need to teach their children how to behave______.
| A．in public | B．in company | C．in peace | D．in trouble |
Helen was fully occupied_____business matters, so we didn’t want to brother her.
| A．for | B．at | C．in | D．with |
-Sorry, do you mind if I smoke here?
-Yes,.
| A． |
you could |
B． |
go ahead |
C． |
I do |
D． |
my pleasure |
It's the first time that he has been to Australia,?
| A． |
isn't he |
B． |
hasn't he |
C． |
isn't it |
D． |
hasn't it |