In order to ________ with the advanced countries, we must keep learning.
The students took the trouble _____ all the ______ leaves away.
--- Two tickets for Sunday. --- Sorry, we’ve got _____ left.
Armed with rich knowledge you have learnt, you can _____ to have an interview for the manager’s job.
______ himself with too much homework, he had no time to participate in outdoor activities.
It is extremely hot this summer. __________, many people say it has been the hottest in the past 30 years.