—When are you leaving for Guangdong?
—My plane at six．
| A．took off | B．would take off | C．will take off | D．takes off |
—Why didn’t you finish the task? —I didn’t think it is ________ the effort.
| A．worthwhile | B．deserving | C．valuable | D．worth |
It was hard for him to fit in a new class, in which ______ he was familiar with.
| A．each | B．neither | C．both | D．none |
We all think that the plan you come up with ____________ the work is very practical.
| A．completing | B．completed | C．to complete | D．complete |
They can find whatever they need in the supermarket, ______ is always busy on Sundays.
| A．which | B．when | C．where | D．who |
Beyond the lake _____ quantities of birds coming from the North every winter.
| A．flies | B．flying | C．flied | D．fly |