Open the brackets in the proper tenses: 1) I (to look)

Open the brackets in the proper tenses: 1) I (to look) round and (to see) that somebody (to leave) his bag on the bench. 2) Not only Jane but also her sister (to be) at the party this week. 3) The number of days in a week (to be) 7. 4) Sally (to buy) a new dresslast month but she (not to wear) it yet. 5) Please wait for him here till he (to come) back.