The population got out of control because there were no natural ………. to keep it in check.
A. predators
B. transports
C. excavations
D. generations
Random Topics:
ModifiersConditional Sentence Type 2 and Type 3Noun PhrasesPerfect and Past TenseOn, At, ByModal Verbs in ConditionalsCorrelative conjunctionsIntensifiers: Really vs VeryPhrasal Verbs with up and downGerund vs InfinitiveOther quiz:
Modals › ViewHow can you show that you are sure about a fact?
A. Avoid making any statements about the fact.
B. Use clear and strong language to show you are sure.
C. Use unclear language to show you are not sure.
D. Use language that suggests possibilities.
Grammar & Vocabulary › View
Amy can’t stand ………. aerobics; she prefers swimming.
A. to be doing
B. doing
C. having done
D. to do
Future Tenses › ViewWhat is the rule for forming negative sentences in future simple tense?
A. Use ‘would not’ + base form of the verb
B. Use ‘will not’ or ‘won’t’ + base form of the verb
C. Use ‘will’ + base form of the verb
D. Use ‘shall not’ + base form of the verb
Frequency Adverbs › View
She _____dinner for the family.
A. cooks often
B. often cooks