Are babies carefree(无忧无虑)? A new study from the US says that 2﹣year﹣ old babies care about _________. ( )
A.how others saw them
B.how do others see them
C.how others see them
What were you doing ______ I knocked at the door?
I was sleeping.( )
A.unlessB.onceC.whenD.while
Mount Xiaolei is not far away from here,but it will still take us a few hours ______ there by bike.( )
A.gettingB.to getC.gotD.get
Hi,Sara.Is this ______ English book?
No.______ is on the desk.( )
A.your; MineB.your;MyC.yours;MineD.your;My
It is necessary ______ us to help our friends out when they meet difficulties.( )
A.toB.ofC.withD.for
What did you do last night,Bob?
First I did my homework,and then I played ______ piano for half ______ hour.( )
A.the;aB./;anC.the;anD.a;the