Passive voice 3

Only a small number of survivors ................ by the emergency services so far since the building...................

• were resuced, had collapsed

• are being rescued, is collapsed

• have been rescued, collapsed

• had rescued, was collapsed

When I ................ at the building site, the central heating ................... .

• was called, installed

• was calling, had installed

• called, was being installed

• have called, will have installed

Since all the seats on the train ....................., we ........................ all the way here.

• occupied, will have to stand

• were occupied, had to stand

• have occupied, were to stand

• had occupied, must have stood

A great deal of research ................... out in the field of genetic engineering in recent years.

• is being carried

• has been carried

• will be carried

• would have carried

Sugar-free chewing gums .............. in the 1950s, and by the 1980s several brands ............... on the market.

• were introducing, were appearing

• had been introduced, will appear

• were introduced, had appeared

• would have introduced, appeared

The medicine ...................... in use for many years when it..............to have a number of harmful side effects.

• will be, has declared

• has been, will be declared

• was, had declared

• had been, was declared

It appears that, in the future, vast sums of money .................... in order to solve the problem of air pollution.

• are going to spend

• have been spending

• could have spent

• will have to be spent

African elephants .................... from their Indian cousins by the size of their ears.

• have distinguish

• will distinguish

• used to distinguish

• can be distinguished

It says on the package that these tablets ................... out of children's reach.

• will have kept

• ought to keep

• should have kept

• must be kept

Recently, a number of new rules ............................. in our company to encourage the employees to arrive punctually.

• are implementing

• have been implemented

• will be implemented

• were being implemented