I often help my mom do some cleaning _______ Sundays.
| A．at | B．in | C．of | D．on |
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 |