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 ...

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