___we can’t understand is ____he didn’t join us in our discussion.
| A．That; why | B．Which; how | C．What; what | D．What; why |
As is known________ us, the actress is known________ her excellent acting
| A．for; as | B．to; for | C．as; for | D．to; as |
The boss went into the house ,the five boys in the rain .
| A．left ;standing | B．leaving ; standing | C．left; stand | D．leaving ; stand |
This is the small house less than 15 square meters, under ______ roof lives a large family of three generations.
| A．which | B．that | C．its | D．whose |
Since then the number of people taking driving lessons ________ 20％.
| A．has increased to | B．increases by | C．has increased by | D．have increased by |
To understand the grammar of the sentence, you must break it ____ into parts.
| A．down | B．up | C．off | D．out |