50. The lazy boy got up very late and went to school in a hurry. When he arrived at school, he found that he had put his socks on _______.
| A．outside | B．inside out | C．side out | D．back out |
many times, but he still couldn’t remember the Chinese meaning of this word.
| A．Having been told | B．Although he had been told |
| C．He had been told | D．He has been teaching |
Whenever I enter the library, I see himat the back of the library reading.
| A．sit | B．sat | C．seating | D．seated |
This sweater fits me, but I can’t afford to buy. I have to choosewhich is cheap enough for me.
| A．it; that | B．that; it |
| C．it; one | D．that; the one |
People are living in world where mouse clicks rule our life, so online searches have become _______must.
| A．the; / | B．/;a | C．a; a | D．a; the |
My friend has returned from the UK. Sheat Oxford for four years, during which we communicated with each other on the Internet.
| A．studied | B．has studied |
| C．had studied | D．has been |