You'll get better grades ________ you follow the teachers'advice．（ ）
| A． |
if |
B． |
until |
C． |
though |
D． |
while |
Jane ____ to call me last night， but she didn't．（ ）
A．supposedB．supposes
C．was supposedD．is supposed
Could you please speak a little louder？ I ____ hear you very well．（ ）
A．can'tB．mustn'tC．shouldn'tD．needn't
We couldn't buy anything because ____of the shops were open．（ ）
A．allB．bothC．nothingD．none
Did you read your favorite books ____ April 23？ It was World Book Day．（ ）
A．forB．atC．onD．in
The bed piano allows a music lover to play ____ piano while he is lying in bed．（ ）
A．aB．anC．/D．the