I was writing a letter she was making a telephone call．（ ）
A．whileB．whenC．before
Edward and William are brothers．There is uncommon similarity between two boys．（ ）
A．an； 不填B．an； theC．a； 不填D．a； the
I hate watching TV ads．It's just a waste of time．
．Some are quite amazing．（ ）
A．Good ideaB．I agree with you
C．That's OKD．I didn't think so
Richard is studying in Germany．I wonder ．
On the phone．（ ）
A．how his parents keep in touch with him
B．why his parents keep in touch with him
C．how do his parents keep in touch with him
D．why do his parents keep in touch with him
Sandy，the glass is broken．How did that happen？
Sorry，Mum．I don't know．I outside．（ ）
A．playB．was playing
C．have playedD．am playing
The couple will be away for a while and they need someone the baby．（ ）
A．look afterB．looking after
C．looked afterD．to look after