It's impolite to ________your teachers' office without knocking at the door．（ ）
| A． |
describe |
B． |
check |
C． |
choose |
D． |
enter |
-Do you know ________？
-Let me see．I remember it was on March 18th．（ ）
| A． |
why did they move here |
| B． |
why they moved here |
| C． |
when did they move here |
| D． |
when they moved here |
Walking along the river， I met a friend of _______．（ ）
| A． |
fathers |
B． |
father's |
C． |
father |
D． |
fathers' |
-Which is _______ season in Lhasa？
-I think it's summer．（ ）
| A． |
good |
B． |
better |
C． |
best |
D． |
the best |
I hope to go to France some day _______ there are many famous museums．（ ）
| A． |
though |
B． |
unless |
C． |
because |
D． |
where |
Tom with his friends _______ to Shanghai many times before．（ ）
| A． |
have gone |
B． |
have been |
C． |
has gone |
D． |
has been |