— ________do you go to see your grandfather?
— Twice a month.
A. How soon B. How long C. How often D. What time
The college students insisted on being sent to work ________they were most needed ________they graduated.
A. where; when B. if; unless C. because; while D. though; as
Only when air moves________.
A. it can be felt B. can we feel it C. can it feel D. we can feel it
________meeting will begin is still unknown.
A. If the B. That the C. When the D. The
The children were ________excited to see ________many strange things in the museum.
A. very; that B. much; so C. too; such D. too; so
The little boy was ________frightened ________move.
A. both; and B. too; to C. either; or D. not; until
