Early experiences taught me not to be overly _ about shopping by mobile phone because there is a high risk of being cheated.
| A．particular | B．enthusiastic |
| C．cautious | D．casual |
At first I regretted _____ them to stay, but we soon became great friends.
| A．to invite | B．invited | C．to have invited | D．inviting |
Most of my friends shop at the stores _____ the goods are very cheap.
| A．which | B．where | C．whose | D．Why |
Weclimbedhigher_____wemightseethescenesbetter.
| A．sothat | B．even though | C．in case | D．as if |
According to the factory safety rules, all accidents _____ be reported to the safety officer.
| A．may | B．can | C．would | D．shall |
John seemed puzzled about _____ the question meant.
| A．how | B．why | C．what | D．Which |