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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Metal _____ making machines and many other things. [ ]
A.
used to
B.
is used for
C.
is used as
D.
is used to
【单选题】______he was tired,______he didn’t stop______.
A.
Although ; but; to rest
B.
/; but; to work
C.
Although;/; rest
D.
Although;/; working
【单选题】—Mr Hu, can you tell us how to learn math well?—Sure. But remember nothing can be learned _______ hard work. [ ]
A.
by
B.
at
C.
without
D.
for
【单选题】---When can you come to school this afternoon ? ---______ about seven ．
A.
On
B.
At
C.
Of
D.
In
【单选题】Betty will ring me up when she ________ in Beijing. [ ]
A.
arrive
B.
arrives
C.
arrived
D.
will arrive