Last month I traveled across desert by camel，achieving amazing
experience that I will never forget．
| A．a；the | B．the；an | C．the；／ | D．a；／ |
____ quiet, for, you see, the baby is sleeping!
| A．To keep | B．Keep | C．Keeping | D．Kept |
Sadly, ____ I remember was a beautiful lake two years ago is now a smelly wasteland.
| A．where | B．what | C．which | D．there |
One of the advantages with the new tool is that it is users ____. Users can handle it with less effort and more convenience.
| A．friendly | B．good | C．well | D．pleased |
Suspecting him of robbing the bank, the Security Police were ___ his phone calls.
| A．looking | B．glancing | C．monitoring | D．staring |
--- Are you angry? --- Yes. He should at least answer when ____.
| A．speaking | B．spoken to | C．spoken | D．speaking to |