Mega 2 - Unit 5

Have they discovered life on other planets ( – – – )?

• for

• ago

• since

• yet

A: When ( – – – ) DELL introduce the first PC.

B: in 1981

• do

• does

• did

• done

In 1908, a small asteroid ( – – – ) over Siberia.

• explode

• exploded

• has exploded

• have exploded

He ( – – – ) as a scientist for many years.

• have worked

• has worked

• worked

• work

We ( – – – ) to Jeddah three years ago.

• move

• moved

• has moved

• have moved

We ( – – – ) in New York since October.

• live

• lived

• has lived

• have lived

She ( – – – ) call her mother last night.

• doesn't

• didn't

• haven't

• hasn't

We ( – – – ) used our car for a long time.

• don't

• didn't

• haven't

• hasn't

People ( – – – ) credit cards since 1951.

• have

• had

• have had

• has had

I ( – – – ) on a vacation to the Maldives last summer.

• go

• went

• has been

• have been