He ________ as the tallest boy in the crowd, so I spotted him easily.
| A．stood out | B．picked out | C．tried out | D．let out |
31．In summer, food will go bad if_________in room temperature.
| A．leaving | B．left | C．being left | D．having left |
30．QQ,______you can chat with your friends, makes communication easy.
| A．why | B．which | C．that | D．Where |
29．Someone________his car in front of my house and it is blocking my driveway.
| A．has parked | B．is parking | C．parked | D．had parked |
28．The film is very humorous but_________can be enjoyed unless you understand English culture.
| A．everything | B．something | C．nothing | D．Anything |
27．---Your composition is full of mistakes.
---I wish I_________more careful.
| A．would have been | B．had been | C．would be | D．Were |