You don't need to describe her, I ___ her serveral times.
| A．had met | B．have met | C．met | D．meet |
Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.
| A．frequently | B．significantly | C．steadily | D．consequently |
Comparison may make something appear more beautiful than it is when ______ alone.
| A．to see | B．seeing | C．is seen | D．seen |
Jessica has always been honest and straightforward, and it doesn’t matter ______ that she’s talking to.
| A．who is it | B．who it is | C．it is who | D．it is whom |
——John always thinks of others instead of himself.
—— So he does. It is _______ of him to want to help others.
| A．aggressive | B．conventional | C．evident | D．typical |
Scientific researches show that to _________ a language one had better often get exposed to it.
| A．acknowledge | B．access | C．acquire | D．assess |