According to recent reports, one of the rare animals, _____ crocodile, will be in danger of dying out in _____ 2020s.
| A．a; / | B．the; the | C．the; / | D．/; the |
—You may find the key to the math problem on page 107．
—Ah, it's so simple． I wonder why I _of that．
| A．hadn't thought | B．haven't thought |
| C．didn't think | D．wasn't thinking |
A turning point of the continuously high housing price won't appear suddenly because there must be a certain process _many factors lead to the change．
| A．which | B．what | C．where | D．that |
---Ken, _, but your radio is going too loud．
---Oh, I’m sorry． I’ll turn it down right now．
| A．It doesn't hurt to ask | B．I'm crazy about it |
| C．I’m really tired of it | D．I hate to say it |
When chatting with her on the mobile phone, the battery _dead suddenly.
| A．went | B．came | C．remained | D．changed |
His explanation that he was at loss what to do next doesn't hold water.
| A．a ;/ | B．a; the | C．the; / | D．/;/ |