1 . Good teachers have to guarantee         adequate amount of input in English.

A．an

B．a

C．the

D．不填

2 . The 2013 Kaifeng Chrysanthemum Fair was ___________ great success. ___________ number of visitors was reported to reach more than 4,000,000.

A．a; A

B．a; The

C．the; The

D．不填; A

3 . ______ old lady watching flowers in the garden is ________ artist.

A．An; an

B．The; a

C．The; an

D．An; the

4 . I had ________ interesting experience playing ping-pong with the coach with ________ rich experience last year.

A．the; a

B．an; an

C．/; the

D．an; /

5 . The Amphicar is_____unique means of transport that can smoothly travel between waterways and land. (用适当的词填空)

6 . Her mother ate nothing at ________ supper yesterday, but today she ate ________ rich supper.

A．/; /

B．/; a

C．the; a

D．a; /

7 . Following the vaccination campaign, there was ________ substantial decrease in the number of COVID-19 cases in the community. (用适当的词填空)

8 . “This is ______most useful reference book.” a teacher from ______ European country told us in class.

A．the; a

B．a; /

C．/; /

D．a; a

9 . Having filled in the application form, the student planned to make ______ good first impression ______ the interviewers.

A．a; on

B．the; with

C．the; of

D．a; to

10 . China has_________ population of 1.4 billion, 80 percent of whom________ asked to stay at home during the epidemic (疫情) of coronavirus.

A．a; was

B．/; was

C．a; were

D．the; were