1 mystery

2 existence

3 trick

4 trace

5 alien

6 objects

7 meteor

8 evidence

9 planet

10 sampled

1 I wish I hadn't given Dennis my phone number.

2 There is an eight o'clock train to Hue every morning

3 You should have invited him to your party.

4 I asked Mrs. Hoa if/whether her little son was good at English.

5 If you happen to find my book, could you let me know?

1 B

2 C

3 D

4 A

5 B

If you run so fast, you will hurt yourself

If his brother hadn't driven so fast, they wouldn't have crashed into the other car.

If I knew her number, I would ring her up.

If you don't turn off the TV now, I will tell your mom.

If she weren't often absent from class, she could keep pace with her classmates.

If Nina hadn't been ill, she could have attended the meeting.

If the pain didn't increase, I wouldn't have to go to the doctor.

If it hadn't been hot outside, we wouldn't have decided to go to the pool.

If his friends hadn't been so late, they wouldn't have missed the train.

If this problem were important, we couldn't ignore it.

A doctor, who was really kind, examined me last Friday.

Dublin, which is the capital of Ireland, is my favourite city.

This is the swimming-pool, where I used to go swimming.

Samuel Johnson, who was the son of a bookseller, was born in 1709.

Mr Kemp, who teaches physics in Boston University, is going to retire next year.

Yesterday I met a woman named Susan, whose husband works in London.

He picked up a handful of stones, one of which was sharp.

I have collected a lot of foreign stamps, none of which is from Japan.

They have made friend with a number of foreigners on Facebook, none of whom is from Thailand.

There are 14 girls in my class, a few of whom are my friends.

He was carrying his belongings, many of which were broken.

He had thousands of books, most of which he had read.

My father has sent some cakes, which he made.

Why don’t you want to eat this ice-cream, which she spent a lot of time doing for you?

There were a lot of people at the party, many of whom I had known for years.

Nobody can find the boy, who has been lost since January.

He looks very angry with his daughter, who is wearing a short and red skirt.

We don’t know how to solve this problem, which makes us stressed.