—Who bought you this snow globe? .

—My sister gave it _____ me _____ my  tenth birthday. [ ]

A. to; on                  

B. to; in

C. for; on                

D. for; at

_______ I take part in a group discussion or try to speak English to someone, I find it difficult to express myself.

A．If only

B．Every time

C．Now that

D．In case