Mars has almost every feature ……………………… (that / what / this) earth has. Scientists have already discovered hills, craters, and dry riverbeds ……………………. (on / in / at) the Red Planet. New images now show that some parts of the Martian landscape might also be dotted ………………………. (with / about / to) caves. If confirmed, these caves could be ………………………… (among /between) the only places on Mars to find evidence of past or present microbial life.

Fill in the blanks.

 Fill in the blanks with an appropriate verb form.

 Fill in the blanks with an appropriate verb form.

Fill in the blanks with an appropriate preposition.

 Fill in the blanks with an appropriate tense form.

Researchers ………………… (built / have built / had built) what they ………………. (called / have called / call) an early version of a robotic servant for home.

Fill in the blanks with appropriate prepositions.

The summer vacation is due ………………… (in / by / on) a few weeks. There are plenty of fun and meaningful activities kids can engage ……………….. (with / in / for) during the much anticipated break.