I _____ a math problem with Joe when Mike called me up．（ ）
| A． |
have discussed |
B． |
discussed |
C． |
was discussing |
We should take care of the earth ____ we can make a better world to live in．（ ）
A．so thatB．untilC．even ifD．while
Young people are encouraged to work hard ____their own dreams．（ ）
A．achieveB．achievesC．to achieveD．achieved
Nobody taught the old lady how to use Wechat． She learned it all by ____．（ ）
A．sheB．herC．herselfD．hers
Fishing is one of ____ activities among the middle﹣aged people．（ ）
A．popularB．more popular
C．most popularD．the most popular
I think tea will taste better ____ some milk in it．（ ）
A．forB．withC．fromD．at