1.   After the security alert, most of the firms affected were open for business on Monday morning.

2.   And we had to keep an eye open for police patrols.

3.   He smiled, holding the passenger door open for her.

4.   I always keep my eyes open for discounts and special offers.

5.   It is open for most of the year, but you need to book well in advance for any specific performance.

6.   It took a long time to bring the fire under control, the local pubs kept open for three days and nights.

7.   Managers should keep a watchful eye open for the danger signals.

8.   Paul held the door open for a woman pushing a trolley of heavy books.

9.   Remembering his duty, he strode briskly up the stairs, keeping his eyes open for any suspicious signs.