Tenses Worksheet For Class 10 | Gap Filling Exercise

Fill in the blanks with an appropriate form of the verb.

Class 9 Tenses Worksheet

The greenhouse effect …….1……… when man-made and natural gases …….2…….. on earth enter the atmosphere and trap energy from the sun, …….3……. the planet’s surface temperature. The major green house gases ……..4…… carbon dioxide, methane, water vapour and nitrous oxide.

According to reports global warming ………5…….. a stage where it is unstoppable. The scientists, however, ……..6…… leaders to reduce emissions and also to adapt to a warmer world with wilder weather.

1. (i) caused; (ii) causes; (iii) is caused; (iv) has caused
2. (i) produces; (ii) produced; (iii) is produced; (iv) has produced
3. (i) raise; (ii) raises; (iii) raising; (iv) raised
4. (i) is; (ii) are; (iii) was (iv) were
5. (i) is reached; (ii) reached; (iii) has reached; (iv) have reached
6. (i) urging; (ii) urge; (iii) urges; (iv) are urging

Answers

The greenhouse effect is caused when man-made and natural gases produced on earth enter the atmosphere and trap energy from the sun, raising the planet’s surface temperature. The major green house gases are carbon dioxide, methane, water vapour and nitrous oxide.

According to reports global warming has reached a stage where it is unstoppable. The scientists, however, urge leaders to reduce emissions and also to adapt to a warmer world with wilder weather.