When a person wakes up in the morning, seven items are necessary and unavoidable in his or her life: firewood, rice, oil, salt, soy sauce, vinegar and tea.

The saying     1     (update) recently, and it is now widely accepted     2     the seven items have been integrated into one thing-a parcel.

The     3     (adjust) saying illustrates the importance of parcels in Chinese people’s lives nowadays.

Although the delivery industry has boomed in the past decade, and many people rely     4     (heavy) on parcels to maintain their normal lives, it is easy     5     (forget) the most important part of the network-the millions of couriers who transport the items to their recipients.

In China, these essential people usually have busy schedules     6     handle heavy workloads. For example, in big cities such as Beijing, each courier usually collects and delivers 200 to 300 parcels a day, even during off - peak     7     (period).

They often wear colorful uniforms and ride electric bikes through the streets and communities. People call them “busy bees” in honor of       8     (they) hard work.

Sometimes, they rush to meet their schedules and aim to deliver     9     large number of parcels, raising the risk of traffic accidents. Sometimes they work overtime to complete deliveries. Occasionally, they are subject     10     unreasonable complaints.