Technology has quickened the rate _________ we communicate with the world around us.
| A．for which | B．at which | C．to which | D．with which |
They smiled continuously, _____ was said.
| A．no matter how | B．no matter when |
| C．no matter what | D．no matter where |
_____ hard I try, he just refused to listen to me.
| A．However | B．Whatever | C．Whenever | D．Wherever |
She was angry only _____ they were late again.
| A．for | B．as | C．because | D．since |
Young people should go ____ working conditions are difficult.
| A．in which | B．which | C．that | D．where |
On a peaceful summer day, he went to swim in the sea _____.
| A．at the first time | B．for the first time |
| C．the first time | D．in the first time |