1, haven't eaten

2, have never been

3, yet

4, has worked

5, has worked

6, have found

7, not been

8, has given up

9, Have you read

10, haven't found

11, have lain

12, have been

13, Have you ever tried

14, have you taught

15, was

Question 2:

1, for

2, since

3, for

4, for

5, since

6, for

7, since

8, for

9, since

10, for

~~HỌC TỐT~

Exercise 2:

1, haven't eaten                                                                            CHÚC

2, have never been

3, yet                                                                                              BẠN

4, has worked

5, has worked                                                                                 HỌC

6, have found

7, not been                                                                                      TỐT

8, has given up

9, Have you read                                                                             THI

10, haven't found

11, have lain                                                                                   HOẶC

12, have been

13, Have you ever tried                                                                   KIỂM

14, have you taught

15, was                                                                                            TRA

Exercise 3:

1, for                                                                                                  SẼ

2, since

3, for                                                                                                 ĐẠT

4, for

5, since                                                                                             ĐIỂM

6, for

7, since                                                                                             CAO

8, for

9, since                                                                                              NHA

10, for