Though Bill is very young，he has a lot of ______ about Chinese history．（ ）
| A． |
information |
B． |
knowledge |
| C． |
background |
D． |
experience |
Last Thursday when I got to the railway station， I_____I left my ID card at home．（ ）
| A． |
realised |
B． |
believed |
C． |
thought |
D． |
considered |
Where're my keys？ I'm afraid I lost them again．
Don't worry! With the new lock， you_____search for them any more．（ ）
A．shouldn'tB．can'tC．mustn'tD．needn't
How was your trip to the British Museum？
I could_________speak English and was completely silent during the visit．（ ）
| A． |
hardly |
B． |
always |
C． |
usually |
D． |
often |
You look so______．What's wrong？
I can't find my mobile phone．（ ）
| A． |
tired |
B． |
relaxed |
C． |
excited |
D． |
worried |
Be quick， Sara! The taxi is waiting for us outside．
A moment， please． I_______some visitors our products．（ ）
| A． |
showed |
B． |
am showing |
| C． |
was showing |
D． |
show |