This tree___ planted by my great-grandfather half a century ago. a)

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