For and since Andrew is a very hard-working student. It39;s midnight

For and since Andrew is a very hard-working student. It39;s midnight and he is still working at his computer. Write sentences with the present perfect and for or since. be / at his computer / six hours He39;s been at his computer for six hours. 1 not / have / any fun / a long time ................................................................ 2 have / a cold / a week .. 3 not / see / his friends / ages 4 not / do / any спорт / last year 5 be / busy with his studies / months ..............................................