As long as I can remember, ___________I called, his wife would answer the phone.
A：however
B：whenever
C：whatever
D：whichever
兔子和乌龟在100米的环形跑道上赛跑．它们从同一地点同时出发，乌龟每爬行5米，兔子超过它一圈．当乌龟爬完一圈时，兔子跑了（ ）圈．
用 ____ 颗同步卫星就可以实现全球通信；光纤通信是利用 ____在光导纤维中多次反射把信息从一端传输到另一端．
How many ____ (jars , car )?
