1 . His statement was so ______ that it was difficult to make out that he was trying   to express.

A．vague； what was it	B．ambiguous； what it was
C．explicit； what it was	D．clear； what was it

2 . - How long is it       you picked up your badminton training?
- It was not until my finance became better in last December       I started the training.

A．that; when

B．until; that

C．since; that

D．before; when

3 . Some of the students in our class can’t figure out ______ it is that puts them under great pressure and makes them tired of finishing homework on time.

A．where

B．when

C．what

D．how

4 . It is through years of research ________ scientists have discovered the relationship between social media addiction and depression.

A．since

B．before

C．that

D．when

5 . It was President Xi Jinping_______visited the navy troops on April 19 and urged that naval force_______.

A．who; strengthen	B．whom; strengthen
C．who; be strengthened	D．who; to strengthen

6 . President Xi underlines that it is only with joint efforts to keep maritime peace ________ build a maritime community with a shared future for mankind.

A．can we

B．we can

C．that we can

D．that can we

7 . ---_________ makes your son feel blue today?
---_________ to watch his favourite cartoon Paw Patrol.

A．What it is that; To be forbidden	B．What is that; Forbidden
C．What is it that; Being forbidden	D．That is what; Having forbidden

8 . ---It is _____ he often failed in exams _____ makes his parents worried about him.
---- Actually, they needn’t worry so much.

A．what, that

B．that, what

C．that , that

D．/, that

9 . —Have you searched the kitchen for your car key?
—No. It was in the study        I remember I left it.

A．which	B．where
C．that	D．as

10 . Up till now, there has been no scientific evidence about ________ caused the death of dinosaurs.

A．what is it that

B．what it was that

C．it was what

D．what is it