Of the three statements he has suggested __ the heating problem, I think the last one is the best.
| A．solving | B．to solve | C．to solving | D．solve |
I wouldn't manage to do it___ you had explained how.
| A．unless | B．until | C．when | D．since |
She often wears the same kind of skirt ___ her twin sister does.
A, that B.which C.as D.what
Don’t talk such things ___ you don't understand.
| A．that | B．which | C．what | D．as |
This is the same bicycle ___ I lost.
| A．as | B．that | C．which | D．A and B |
There are no children ___ love their parents.
| A．that do not | B．who does not | C．that | D．who |