1 . It was ________ I came across my best friend ________ I realized I had left the book at home that we had attempted to finish together today.

A．when; that

B．that; when

C．that; that

D．when;when

2 . Professor Smith insists on the truth________it is only by studying bones of ancient people________we can reveal the mystery.

A．that; then

B．/; that

C．that; that

D．that; when

3 . My experience tells me that it’s not _______ you are given but how you make use of it _______determines who you are.

A．which; what

B．what; that

C．that; which

D．what; which

4 . It is on the occasions ________ we don’t realize those talking to us are stealth marketers ________ they are paid to advertise some products to us.

A．that; which

B．which; when

C．where; that

D．when; that

5 . I’m wondering_________you want me to say for the sake of your innocence.

A．what is it that

B．what is it

C．what it is that

D．it is what

6 . It was ______ I came to know the importance of English _____ I began to pay more attention to my English classes.

A．when, that

B．since, which

C．since, that

D．when, which

7 . It was the trip to Tibet three years ago________completely changed his attitude towards life.

A．that

B．when

C．who

D．how

8 . It was in 1999________emojis were first introduced in Japan,________helps people express their feelings.

A．which; that

B．when;who

C．that; which

D．what; where

9 . It was at the age of 5 ________ he left his hometown for Shanghai.

A．that

B．when

C．which

D．as

10 . It was ______ he worked out the maths problem that we wanted to know.

A．what

B．how

C．that

D．which