286. In 1920 Poland and Russia were still at _______and they mustn’t trade in agricultural products with each other.
| A．battle | B．campaign | C．struggle | D．War |
__________ our efforts to save houses dating back to the Ming Dynasty, the local government decided to pull them down to build modern buildings there.
| A．In case of | B．In spite of | C．In terms of | D．In praise of |
With the word “ PM2.5” _________ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.
| A．constantly | B．consequently | C．permanently | D．immediately |
Hiking is _____ great fun. You will get close to ____ nature and take exercise at the same time.
| A．a; the | B．a; 不填 | C．不填；the | D．不填；不填 |
I couldn't imagine ______difficult it was for these badly injured victims to make it to the hospital.
| A． when | B．how | C．what | D．where |
—Where did you get this book?
—I picked it up from a second-hand bookshop if you ______know.
| A． must | B．will | C．can | D．shall |