Question

This tree___ planted by my great-grandfather half a century ago. a) was b)was being c)had been
This sort of advertisement___ seen everywhere. a) has been b) is being c) is
Letters___ sent to all our clients every week. a) have been b) be being c) are
Clare___ taken to hospital only tomorrow. a)is b) will be c)is being
The building___built by an American architect last year. a) was being b)was c)is

Answer 1

This tree was planted by my great-grandfather half a century ago.
 a) was b)was being c)had been
This sort of advertisement is being seen everywhere.
a) has been b) is being c) is
Letters are sent to all our clients every week.
 a) have been b) be being c) are
Clare will be taken to hospital only tomorrow.
a)is b) will be c)is being 
The building was built by an American architect last year.
a) was being b)was c)is