We are going to have a party ______ the evening of June 30th．（ ）
| A． |
on |
B． |
in |
C． |
at |
D． |
for |
﹣﹣May I come in？____，please．（ ）
| A． |
Hold on |
B． |
Sit down |
C． |
Come in |
Boys and girls，look____the blackboard，please．（ ）
| A． |
at |
B． |
out |
C． |
in |
I will never forget the people help me a lot in my life．（ ）
| A． |
whose |
B． |
when |
C． |
which |
D． |
who |
We should study hard we can get much knowledge．（ ）
| A． |
when |
B． |
so that |
C． |
unless |
D． |
in order to |
My father asks me in the street．It's dangerous．（ ）
| A． |
not to play |
B． |
not play |
| C． |
not playing |
D． |
don't play |