How late was the train（） A: 20 minutes B: 30 minutes C: 40 minutes

What is the recommended amount of time spent on cleaning A: 5 minutes B: 10 minutes C: 15 minutes D: 20 minutes

When did the man order A: 30 minutes ago. B: 20 minutes ago. C: 10 minutes ago.

How many minutes ofConcrete mixed in stationary mixers and transported by non-agitating equipment shall be pay? A: 30 minutes B: 20 minutes C: 40 minutes D: 15 minutes

Listen to the following dialogue, and then choose the best answer for each question． A: About 5 minutes B: About 10 minutes C: About 15 minutes D: About 20 minutes

You will be placed with a local family usually within _____ from your campus. A: 20 to 45 minutes B: 15 to 35 minutes C: 15 to 40 minutes D: 25 to 40 minutes

The traffic was very heavy, otherwise I _____ there 20 minutes earlier.

​If you are a representative of the host, when should you arrive?‌​‌ A: Just on time. B: At least 10 minutes early. C: At least 20 minutes early. D: At least 30 minutes early.

Your dog needs at least 20 minutes of ________ exercise every day.

I ______ (be) at the bus stop for 20 minutes when a bus finally came.