I have ________ useful knife and my sister has _______ eraser.
A．a; an B．an; a C．a; a D．an; an
The tall boy ______ you just met is my brother.
A．who B．which C．where D．when
-- Peter knows much French.
-- ________.
A．So do I B．So am I
C．Neither do I D．Neither am I
Which sign tells you to go straight ahead?
A. B. C. D.
The new teaching building ________ before the new term begins.
A．must be finished B．must finish
C．must finished D．must being finished
The teacher asked the students ________.
A．what they were doing at that moment
B．what were they doing at that moment
C．how are they doing at that moment
D．what they are doing at that moment
