E8 - Space Exploration

We usually observe the moon with a telescope when the sky ______ clear.

• was

• is

• are

• will be

Scientists often ______ data about planets and stars in our galaxy.

• collects

• collect

• collected

• collecting

My sister always ______ questions about alien life after science class.

• asked

• asking

• asks

• is asking

I rarely ______ science fiction books, but I love documentaries.

• read

• reads

• reading

• readed

The space shuttle ________ at 6:00 a.m. tomorrow, so the astronauts have to wake up early.

• take off

• takes off

• will take off

• is taking off

Our school ______ the new unit on space exploration next Monday.

• start

• started

• starts

• is starting

The scientist ______ a new theory about gravity right now.

• explains

• explain

• is explaining

• explained

The aliens in the story ______ in a triangular spaceship at the moment.

• travelled

• travels

• are travelling

• travel

We ______ a video call with astronauts in space at 10 a.m. tomorrow.

• have

• are having

• had

• will have

She ______ a report about UFO sightings this week.

• writes

• is writing

• writing

• wrote