As _______volunteer at the Beijing Expo 2019 （园艺博览会），Lu Ming understands
_________idea of green life better than before．（ ）
A．a； anB．a； theC．the； anD．the； the
He felt tired， so he stopped______a rest under the tree．（ ）
| A． |
having |
B． |
have |
C． |
to have |
Get up early，_____ you will miss your train．（ ）
| A． |
or |
B． |
and |
C． |
but |
I _____ a math problem with Joe when Mike called me up．（ ）
| A． |
have discussed |
B． |
discussed |
C． |
was discussing |
The nurse _____ is looking after the old man is Tom's sister．（ ）
| A． |
which |
B． |
who |
C． |
what |
She is_______famous singer in China and has many fans．（ ）
| A． |
the |
B． |
a |
C． |
an |