Little Jack has learned to do lots of things on his own， ____ he is only four years old．（ ）
A．ifB．thoughC．forD．since
Jane is my new pen pal，I often look forward to ______ her e﹣mail．（ ）
| A． |
receive |
B． |
receives |
C． |
receiving |
D． |
received |
The harder you study，the _______ grades you will get．（ ）
| A． |
well |
B． |
better |
C． |
good |
D． |
best |
Please ______ the lights when you go out．（ ）
| A． |
turn down |
B． |
turn up |
C． |
turn on |
D． |
turn off |
Every day，he gets up early ______ he can catch the first bus．（ ）
| A． |
because |
B． |
since |
C． |
when |
D． |
so that |
The number of the students ______ over 2000 in our school．（ ）
| A． |
is |
B． |
are |
C． |
be |
D． |
were |