The boy is lying on the ground, _________ at the aeroplane in the sky.
| A．looked | B．looking | C．look | D．to look |
Only when I left my parents for Italy____ how much I loved them.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
Look, the book still ____ where I ____ it the other day.
| A．laid; lied | B．lied; lay | C．lies; laid | D．lies; lay |
It was several minutes before I was ______of what was happening
| A．know | B．realize | C．wear | D．aware |
Do you still remember the year _________ China became a member of WTO?
| A．that | B．which | C．when | D．what |