Hi， Steve． Let's swim in the river．
Oh，we can't． It's dangerous． Look at the sign "_________"． （ ）
A．B．
C．
Simon looks worried because he a writing competition and now he's waiting for the result．（ ）
A．entersB．entered
C．will enterD．is entering
We've ordered too much food．I eat any more．
Never mind．Let's take it home．（ ）
A．can'tB．mustn'tC．needn'tD．shouldn't
_____ the scientists have done lots of research on Mars，there is still much waiting to be discovered．（ ）
A．IfB．SinceC．UnlessD．Though
Seeing a bird resting by the window，the boy moved _____ to have a look at it．（ ）
A．politelyB．quietlyC．easilyD．safely
Did anyone call me when I was out？
Yes．A man who called Tom（ ）
A．myselfB．himselfC．herselfD．yourself
B．
B．
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