—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
A. can; must B. can; may
. must; can D. may; must
What do you think of the suggestion _______ he offered us _______ we go to New York for our holiday?
| A．what; that | B．which; that |
| C．which; what | D．what; what |
The first question was quite difficult but the rest _______ easy, _______ surprised us all.
| A．was; which | B．was; that |
| C．were; which | D．were; which |
Though this kind of _______ has some _______, it is good enough for construction(建筑).
| A．materials; shortcomings | B．memorial; shortcomings |
| C．materials; distinctions | D．memorial; distinctions |
The little boy needed the _______ money to deal with the things that remained _______.
| A．remaining; to be settled | B．remaining; to settle |
| C．remained; to be settled | D．remained; to settle |
He is not easy-going, but his trust in his friends will last forever once _______.
| A．to be gained | B．is gained |
| C．being gained | D．it is gained |