Past simple and Present perfect

Scientists ... some major discoveries in the 18th century.

• • Has made

• • Made

• • Maked

• Have made

Answer explanation

I ... contacts with a few of my old friends when I moved away.

• Have lost

• Lost

• Have losed

• Losed

Scientists ...that spider silk can be used in manufacturing bio-materials for medicine.

• Has discovered

• Discovered

• Have discovered

• Have been discovered

I'm sure I .. that he worked in Baku a few years ago.

• Heared

• Have heard

• Was heard

• Hear

Tim Burton ... 15 films and his latest film is "Dark Shadows". Have you seen it?

• Directed

• Has directed

• Was directed

• Is directed

She ... him when they were working in Japan.

• Knew

• Has known

• Was known

• Is known

I ... a member of this forum since January and I like it.

• Was

• Am

• Was been

• Have been

We ... hundreds of letters of support in the last week.

• Received

• Have received

• Were received

• Receive

Don't disturb Anna.  She ...to sleep.

• Has just gone

• Has just go

• Just went

• Just was gone

Why ...me before about it? I would have told you.

• Haven't you asked

• Haven't you ask

• Didn't you ask

• Didn't you asked