Candidates ______ remain in their seats until all the papers have been collected.
| A．must | B．shall | C．may | D．can |
Jack, look! Everybody is doing homework quietly. ________ you make a noise in class?
| A．Could | B．Shall | C．Will | D．Must |
_______ they looked, they saw nothing but ruins after the terrible earthquake.
| A．Whichever | B．Whatever | C．Wherever | D．However |
- Was it because of his laziness_______ he didn't do the experiment successfully?
- No, it was because of his carelessness.
| A．that | B．while | C．for | D．as |
The volunteers will visit the primary school next Monday ,_______all the students are children of migrant workers,
| A．which | B．who | C．when | D．where |
Children of this age should be reminded of________ to do in public places.
| A．what | B．whether | C．how | D．why |