Exercise 7: Choose the correct answers.

1. I’m sure he would mind if we ___________       early.

A. arrive                      B. arriving                   C. arrived                    D. had arrived

2. We ___________    you if we have time.

A. will phone               B. would phone          C. phoned                   D. had phoned

3. If I won the lottery, I  __________        you half the money.

A. gave                        B. had given                C. will give                  D. would give

4. It   __________            be a pity if she married Fred.

A. will                          B. would                     C. can                          D. may

5. If I am free on Saturday, I  _________       to the mountains.

A. to go                       B. could go                 C. went                        D. can go

6. She    _____________          a nervous breakdown if she goes on like this.

A. will has                   B. had                         C. will have                 D. have

7. I know I’ll feel better if I __________     smoking.

A. will stop                  B. stop                        C. stopped                   D. had stopped

8. I could have understood him if he __________      more slowly.

A. speaks                     B. spoke                      C. had spoken             D. would speak

9. He didn’t listen to the teacher. If he _____________       carefully, he   ______         will in the examination.

A. had listened/ would have performed           B. listened/ would perform

C. listens/ will performed                                D. had listened/ had performed

10.    If I knew his address, I ________         round and see him.

A. go                           B. will go                    C. went                        D. would go

Exercise 2: Put the verbs in brackets into the correct forms.

1. It is too bad Helen isn’t here. If she (be)      here, she (know)           what to do.

2. If I (not eat)            breakfast tomorrow morning, I (get)       hungry during class.

3. If you (put)            this red button, the TV will (turn off)      .

4. I (let)              you know if I (find)          out what’s happening.

5. He didn’t listen to the teacher. If he (listen)      carefully, he (perform)     well in the examination.

6. He’s waiting for his mother to come back from Chicago. If his mother (come)                 home, he (have)                                                                                      a lot of presents.

7. He wanted to buy some Christmas presents but he couldn’t. If he (afford)    to buy, his children (be)    very happy to greet a new year.

8. It (be) ______    quicker if you (use)           a computer.

9. (bring)             him another cake if he (not/like)        this one.

10.                          She (be)                           angry if she (bear)       this tomorrow.

Giúp mình với :))

Mọi người giúp mình với ạ! 

                                       - Cảm ơn -

Giúp mình với mn ơi. Nếu có thì Giải thích tại sao đc đáp án đó càng tốt ạ. Thanks!!

Trả lời câu hỏi

x² - 6xy + 9y² - 25

= x² - 6xy + ( 3y )² - 5²

= ( x - 3y )² - 5²

= ( x - 3y - 5 ) ( x - 3y +5 )

B. Ai làm gì?