The couple heard from their son yesterday and they were very happy．（ ）
A．listened to
B．met
C．called
D．received a letter from
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
You came back from Beijing yesterday． Could you tell me______？
I went there by train．（ ）
A．how you went there
B．who you went with
C．what you think of the trip
D．if you enjoy the trip