СРОЧНО!пожалуйста помогите! нужно вставить правильный вариант
1.... conferences is a good way to build business relationships.

a) going

b) attending

c) meeting

d) visiting

2. He went to the doctor complaining... difficulty in breathing.

a) about

b) of

d) in

3. I.... at my report for three hours.

a) worked

b) have worked
c) have already been working

d) are working

4. I supposed that my brother....

a) are sleeping b) had slept

c) will sleeping

d) would be sleeping

5. The book leaves... to be desired.

a) many

b) a lot of

c) much

d) a few

6. If she had known English she would have tried to

the University.

a) resulted

b) to enter

c) promised

d) come

7. I wish I ... gave up smoking.

a) can

b) must

c) may

d) could​​