We don't know the love of our parents _______ we become parents ourselves one day．（ ）
| A． |
until |
B． |
after |
C． |
when |
D． |
since |
Here are your gloves，please ．（ ）
A．put them awayB．put it away
C．put away them
There some good advice about how to reduce air pollution on the Intement．（ ）
A．areB．isC．have
I was writing a letter she was making a telephone call．（ ）
A．whileB．whenC．before
After dinner，he used to computer games，but now he gets used to ．（ ）
A．play，walkB．playing，walking
C．play，walking
He has failed times，but he won't give up a chance．（ ）
A．third，fourB．three，fourth
C．third，fourth