Riding a bicycle can be fun. But _______ you ride a bike to work, and then there isn’t one to ride home?
Don’t touch anything in the lab unless____.A. to be allowed B. allowed C, to be allowing D.allowed to
I hear____ boys in your school like playing football in their spare time,though others prefer basketball.
She may have missed the train,____ she won’t arrive for another hour.
The noise was so _____ that only those with excellent hearing were aware of it.
Have you heard of the case____ a child accused his paeents of being ill-treated?