In the experiment we kept a watchful eye ________ the developments and recorded every detail

The company is starting a new advertising campaign to ________new customers to its stores.

When does your plane take off?—At 3: 00 p. m. tomorrow. I’ve just called the airport to __________ it. [ ]

______ her hard work, she succeeded in passing the exam

“___ comes back home first should cook lunch, ”Mum said.